These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding. Nitrate compounds are usually soluble in water. Naming Chemical Compounds.ppt - Google Slides The balanced equation will be calculated along with the solubility states, complete ionic equation, net ionic equation, spectator ions and precipitates. Magnesium Chloride (MgCl2) - Structure, Molecular Mass - BYJUS Determine whether each compound is ionic or covalent and write the (NH4)2CO3. Chemical bond A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. Na3PO4 + MgI2 = NaI + Mg3 (PO4)2 Net Ionic Equation Na3PO4 + MgI2 = NaI + Mg3 (PO4)2 Net Ionic Equation Net Ionic Equation Overall Chemical Equation Ensure that the elements on both sides of the molecular equation are balanced by using the online chemical equation balancer. See Steps to Balance MgI2 + BaS = BaI2 + MgS, (NH4)3PO4 + ZnSO4 = Zn3(PO4)2 + (NH4)2SO4. Get the free "NET IONIC EQUATION CALCULATOR" widget for your website, blog, Wordpress, Blogger, or iGoogle. View the full answer. These salts are typical ionic halides, being highly soluble in water. Is magnesium and iodine ionic (MgI2)? MgI2 K3PO4 PCl3 Practice: Mixed Formulas. Is MgI2 ionic molecular acid or base? By the conclusion of this unit, you should be able to do the following: Name and write formulas for ionic and covalent compounds. Magnesium iodide is the name for the chemical compounds with the formulas MgI 2 and its various hydrates MgI 2 (H 2 O) x. Because these salts are highly soluble in water, they are typical ionic halides. Take the next atom in the molecule and replace its ending with an "ide" suffix. I love to write and share science related Stuff Here on my Website. NO 2 Ionic covalent Vanadium (IV) oxide Nitrogen dioxide c. CrBr 2 d. CdBr 2 e. SBr 2 Ionic Ionic covalent Chromium II bromide Cadmium bromide Sulfur dibromide f. Na 2Cr 2O7 g. Na 2CrO 4 h. Cr 2O3 i. N2O3 Ionic sodium sulfate magnesium iodide. . Is mgl2 ionic or covalent? For ionic bonds the covalent character can be determined by polarizing power and polarizability but even then those originate from the atom's electronegativity in the first place so I'm not too sure if there is anything but knowing trends in electronegativity that apply to the character of a bond. Covalent ormolecular compounds form when elementsshare electrons in a covalent bond to form molecules. Enter an ionic equation (solubility states are optional) to calculate its complete and net ionic equations. In order to obtain anhydrous MgI2, the reaction should be conducted in a strictly anhydrous atmosphere; dry-diethyl ether can be used as a solvent. Is Mgl2 a ionic or covalent bond? - Answers The attraction between oppositely charged ions is known as an ionic bond. Iron is a transition metal and has oxidation states of F e+2 or F e+3. Assume all reactions occur in aqueous solution. HCl = Polar. The density of its various forms is: 4.43 g/cm3 as an anhydrous solid, 2.353 g/cm3 as a hexahydrate solid, and 2.098 g/cm3 as an octahydrate solid. Compound states [like (s) (aq) or (g)] are not required. These salts are typical ionic halides, being highly soluble in water. Is TiO2 a ionic or covalent bond? Answer = C2H6O is Polar What is polarand non-polar? If cation and anion of an ionic compound are monovalent, solute-solute attractive forces are easily overcome -(i., NaCl, LiBr, KI). mgi2 ionic or molecular. Magnesium reacts with oxygen to produce light that is bright enough to blind you for a short time. Chemical nomenclature practice problems | Math Formulas Nausea, diarrhea, low blood pressure, muscle weakness, and fatigue are all symptoms of magnesium overdose. Misconception Alert Some students like to use the criss-cross method. This salt is acidic in nature since it is derived from a weak base (NH3) and a strong acid (HNO3). Names and formulas of ionic compounds. Naming Molecular Compounds . sodium carbonate decahydrate dinitrogen tetroxide silver (I) acetate cesium sulfide dinitrogen tetroxide hydroiodic acid . Its a sodium salt thats both inorganic and iodide. Each of these reactions produces a white solid and an orange flame. Label the half reaction as either oxidation or reduction. My thesis aimed to study dynamic agrivoltaic systems, in my case in arboriculture. (1 single bond and 3 double bonds with chlorine in its +7 oxidation stat. Naming ionic compound with polyvalent ion. Like other metal oxides it is a basic oxide because it dissolves in water to form calcium hydroxide. The net ionic equation is the chemical equation that shows only those elements, compounds, and ions that are directly involved in the chemical reaction. I am currently continuing at SunAgri as an R&D engineer. Except where otherwise noted, data are given for materials in their standard state (at 25 C [77 F], 100 kPa). The magnesium ion has a 2 charge and the oxygen atom has a 2 charge when an ionic compound is made up of magnesium and oxygen. . Answer = SiCl2F2 is Polar What is polarand non-polar? Convert those aq solns to ions. xH2O. What is the molecular, ionic, and net ionic equations for Copper(II) sulfate + sodium phosphate? Iodide forms a singly charged anion. The chemical compounds with the formula MgI2 and its various hydrates MgI2 (H2O)x are known as magnesium iodide. How do you distinguish a binary molecular compound from a binary acid? How Many Soldiers Died From Friendly Fire In Ww2, Magnesium iodide Mg +2 I - MgI2 Crisscross rule: the charge of . Therefore applying these definitions : H2SO4 = molecular , acid HI = molecular, acid You can use parenthesis () or brackets []. A B; carbon dioxide: CO2: sodium chlorite: NaClO2: aluminum sulfate: Al2(SO4)3: tetraphosphorus decaoxide: P4O10: sulfur hexafluoride: SF6: magnesium bicarbonate: Mg . MgI2 + BaS = BaI2 + MgS Net Ionic Equation The decreasing order of ionic character NaF>NaCl>NaBr>NaI. A B; . K2CO3 (aq) + MgI2 (aq) --> MgCO3 (s) + 2KI (aq) Step 2. The compounds net charge should be zero because magnesium iodide is neutral. Overall Chemical Equation Ensure that the elements on both sides of the molecular equation are balanced by using the online chemical equation balancer. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Compounds that are composed of only non-metals or semi-metals with non-metals will display covalent bonding and will be classified as molecular compounds. Is H2SO3 ionic or molecular compound? - Answers somewhere between an electronegativity difference of 0.5 and 0.0, it's a non-polar covalent. Nonpolar covalent bonds form between two atoms of the same element or between different elements that share electrons equally. Magnesium iodide (MgI2) | MgI2 - PubChem If polar, properly indicate the polarity using the + and - symbols and by indicating the correct dipole moment (otherwise, choose the blank option). Heteronuclear atoms with an electronegativity difference: I'm pretty sure determining this revolves around electronegativity. The covalent bonds are represented by the lines, or sticks, as we call them. Magnesium is one of the essential elements to all cellular life, and its compounds are widely used in construction and medicine. . Overall Chemical Equation Ensure that the elements on both sides of the molecular equation are balanced by using the online chemical equation balancer. Here is what you do. When we have a metal and a non-metal the compound is usually considered ionic.Because we have a metal and non-metal in MgCl2 there will be a difference in electronegativity between the metal and non-metal. To tell if MgCl2 (Magnesium chloride) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that Mg is a metal and Cl is a non-metal. please help me to solve this question: Classify each chemical Ionic compounds are named simply by naming the ions present. 9/10 Quality score 72247+ Completed orders People said. You can override the automatically calculated compound states below. Write the balanced (ionic) redox equation for the conversion of Broz into Bra under acidic conditions. (a) Write the chemical formula for propane. Nonmetals react with metals to form ionic compounds. The reaction of Magnesium metal and Iodine will 'yield' Magnesium Iodide. The bond between the magnesium ion and the perclorate ion is Ionic Bond whereas the bond between chlorine and oxygen is covalent bond. In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together). Sodium iodide has a Na (+) counterion and is a metal iodide salt. Solution. What is the ionic bond for magnesium and iodine? The simplest explanation is that MgI2 is ionic, because Mg is an alkali metal, which reacts by losing electrons, and I is a halogen, which reacts by gaining them. Answer: It is magnesium perchlorate. Because the reaction releases a lot of heat, magnesium burns brightly. Now lets look at lye, a strong base with the chemical formula NaOH (sodium hydroxide). Is ammonia a molecular compound or an ionic compound? MgSO 4 + 2 KI = K 2 SO 4 + MgI 2 See Steps to Balance MgSO4 + KI = K2SO4 + MgI2 Solubility Equation Determine the state or phase of each substance (gas=g, liquid=l, solid/non-soluble=s, aqueous/soluble=aq) in its undissociated form by using the . mgi2 ionic or molecular 2 Answers By Expert Tutors It is the conjugate acid of a weak base (NH4+ is the conjugate acid of NH3) and the conjugate base of a weak acid (NO2- is the conjugate base of HNO2). Compounds that contain hydrogen, oxygen, at least one other element, and have acidic properties are known as: oxyacids. Molecular weight/molar mass of MgCl 2. If it isn't aq (for examle the MgCO3 is (s), you leave it as is. DETERMINE WHETHER EACH SUBSTANCE BELOW IS IONIC, MOLECULAR OR AN ACID. As a result, MgO is the correct formula for this ionic compound. Worked example: Finding the formula of an ionic compound. The salts of strong acid and weak base give acidic solutions . Write balanced molecular, ionic, and net ionic equations (NIE) for each of the following reactions. We will begin by learning the rules of naming ionic compounds first. carbonic acid. - YouTubeYouTube Is CaBr2 acidic or basic? Using the periodic table, predict whether the following chlorides are ionic or covalent: KCl, NCl3, ICl, MgCl2, PCl5 256 Consultants. Oxygen attracts the two valence electrons from the magnesium atom, which are transferred from the magnesium atom to the oxygen atom because it has a higher electronegativity. -The ions from $KCl$ derived from a strong acid (HCl) and a strong base (KOH). Is MgI2 covalent or ionic? - Answers Top Jennifer Tuell 1B Posts: 34 Joined: Fri Apr 06, 2018 6:05 pm Compound states [like (s) (aq) or (g)] are not required. Overdose. The first on-screen kiss between Perry Mason (Raymond Burr) and Della Street, Daphne, Leucothea, Kyrene, Marpesia, Kastalia, Hekuba, Kassandra, Coronis, Thalia, Kalliope Male Lovers Hyacinth and Cyparissus Children Asclepius, Troilus, Aristaeus, Orpheus, Korybantes Siblings Artemis (Twin Sister), Savannah Montanos boyfriend Savannah once dated Jared Yarnall, who they later broke up with in 2013. Click to see full answer Also, electronegativities are 1.2 . Most service stations will accept oil as long as it, He was 76. Remember, with resonance oprating, all the oxygen atoms are chemically indistinguishable in solution and gas phase. Because Mg(OH)2 is listed in Table 15.6. 3.4: Identifying Molecular and Ionic Compounds Chemistry Activity-Exercises Module 5-6 - MODULE 5 Ionic Compound NAME Chemical bond A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. However, the lattice energy can be calculated using a thermochemical cycle. . 2. Chloride CaO Calcium Oxide Al2S3 Aluminum Sulfide MgI2 Magnesium Iodide BaNa2 You should recognize a problem with this one This is two metals - not a binary ionic compound The name of this is Banana (JOKE - haha) Drawing Ionic Bonds 1 - Draw the Lewis structure for each element. Is Na2CO3 ionic or covalent or both? Na3PO4 + MgI2 = NaI + Mg3(PO4)2 Net Ionic Equation So when determining if a molecule is ionic or covalent, it is not always/only dependent on the electronegativity difference? Mg (NO3)2 + KI = MgI2 + KNO3 Net Ionic Equation Because ionic bonds are generally significantly stronger than intermolecular forces in covalent molecules, ionic substances are usually solid at room temperatures. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding. VAPOR PRESSURE Beyond helping to determine the melting point and boiling point of covalent substances, the relative strength of the intermolecular forces in a substance can also . Magnesium iodide is the name for the chemical compounds with the formulas MgI2 and its various hydrates MgI2(H2O)x. Compound states [like (s) (aq) or (g)] are not required. Here, the convention is used where the ionic solid is separated into ions, meaning the lattice energies will be endothermic (positive values). An atom has more polarizing power when it is smaller and has a greater charge because it is easier to distort the electron cloud and attract electrons and an atom is more polarizable when it is larger and less negative because its electron cloud is easier to distort and lose electrons. It is as twice the prepared Ba(OH)2 solution concentration. Magnesium iodide (MgI2) | MgI2 or I2Mg | CID 66322 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological . If you're electronegativity differences are between 1.7 and 0.5 then it's a polar . According to Fajan's rule, the size should be small to have more ionic character. It is freely soluble in water, more rapidly soluble in boiling water, and practically insoluble in alcohol. Covalent Character has more to do with Polarizability which relates to atomic and Ionic radius. As a general rule of thumb, compounds that involve a metal binding with either a non-metal or a semi-metal will display ionic bonding. What are the three properties of ionic compounds. Enter an equation of an ionic chemical equation and press the Balance button. Some metals form more than one ion. Is magnesium iodide an ionic or covalent bond - Bengis Life ionic and covalent character - CHEMISTRY COMMUNITY To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. Register Alias and Password (Only available to students enrolled in Dr. Lavelles classes. Transcribed image text: Classify each compound as ionic or molecular. The Born-Haber Cycle - Video - JoVE It is a neutral salt as it is formed by the reaction of a strong acid and a strong base which results in formation of a salt which is neutral. The formation of molecular bromine (Br) from HBr and KBroz must be derived using redox reactions. Magnesium is a mineral with two electrons in the outer shell. Magnesium is a metal and like most of the metals, it form basic oxides. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3 , the simplest formula for this compound is : Class 11 >> Chemistry >> Chemical Bonding and Molecular Structure >> Ionic or Electrovalent Bond >> Magnesium reacts with an element (X) to Question Magnesium sulfate is an ionic compound as there is a bond between a metal and a non-metal. Use uppercase for the first character in the element and lowercase for the second character. Magnesium acts as a cation and Iodine acts as an anion.The charge of Mg would be 2+ and the I would be 1- . To tell if Na2S (Sodium sulfide) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that Na is a metal and S is a non-me. You can use parenthesis () or brackets []. Acids, on the other hand, are donors of protons. So when determining if a molecule is ionic or covalent, it is not always/only dependent on the electronegativity difference? Iodide is iodines ionic state, which occurs when iodine reacts with another element, such as potassium, to form a salt. MgI2 = ionic Step-by-step explanation Ionic compounds are generally formed by reaction between metals and non metals. You can see the pH value is 12. Magnesium reacts with an element (X) to form an ionic compound. These salts are typical ionic halides, being highly soluble in water. It also has a -1 anionic charge. The decreasing order of ionic character NaF>NaCl>NaBr>NaI. Use uppercase for the first character in the element and lowercase for the second character. A compound that consists of hydrogen and one other non-metallic element is known as: a binary acid. Same is true if one of the two ions in an ionic compound is monovalent (i., BaCl2, MgI2) If both the cation and anion are multivalent, the solute . What is the molecular, ionic, and net ionic equations for Copper(II) sulfate + sodium phosphate? KCl is a neutral salt as it is made from the neutralization reaction of the strong acid(HCl) with a strong base(KOH). In chloroform and hexane, iodine dissolves easily, but not in water. What is calcium's ionic charge? - JacAnswers To produce sodium bromide or sodium iodide, hot sodium will burn in bromine or iodine vapor. Because these salts are highly soluble in water, they are typical ionic halides. NaCl is neutral. ), Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams, Work, Gibbs Free Energy, Cell (Redox) Potentials, Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH), Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust, Kinetics vs. Thermodynamics Controlling a Reaction, Method of Initial Rates (To Determine n and k), Arrhenius Equation, Activation Energies, Catalysts, Chem 14B Uploaded Files (Worksheets, etc. Get the answer to your homework problem. Because ionic bonds between atoms with a large difference in electronegativity form between atoms (difference>1.7 on the Pauling scale will result in an ionic bond), the two atoms would form an ionic bond. Enter an equation of an ionic chemical equation and press the Balance button. For example, molecular oxygen (O2) is nonpolar because the electrons will be equally distributed between the two oxygen atoms. Also, electronegativities are. It is an ionic compound because a non-metal and metal forms an ionic bond.Magnesium is a metal and iodine is a non-metal.In an ionic bond cations lose electrons and anions gain electrons. cristina's restaurant salsa recipe. This compound can be formed from the reaction of Mg(OH)2 (a strong base) and HCl (a strong acid). mixed bond (not ionic, not covalent). To tell if HI (Hydrogen iodide or Hydroiodic acid) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that H is non-metal and Br is a non-metal. Make certain to distinguish between ionic and covalent compounds. Is MgI2 an ionic or a covalent bond? - Quora Compound states [like (s) (aq) or (g)] are not required. Can you name the following ionic compound Fel2? | Socratic In general, molecular compounds form when NONMETALS_combine together. Also, electronegativities are. Production [ edit] Magnesium Chloride. , Using Standard Molar Entropies), Gibbs Free Energy Concepts and Calculations, Environment, Fossil Fuels, Alternative Fuels, Biological Examples (*DNA Structural Transitions, etc. Examples: Fe, Au, Co, Br, C, O, N, F. Replace immutable groups in compounds to avoid ambiguity. Neutralization of any strong acid with a strong base always gives a neutral salt. Question = Is SbCl5 ( Antimony pentachloride ) polar or nonpolar ? Magnesium chloride is slightly acidic because it is formed by the reaction of a relatively weak base. I will omit the aq part on each ion t save typing but you should put it in. Use uppercase for the first character in the element and lowercase for the second character. Which is more ionic? NaF, NaCl, NaBr, NaI - Toppr Ask Question = Is SCl6polar or nonpolar ? Does MgI2 have ionic or covalent bonds? - Answers Startseite > Uncategorized > mgi2 ionic or molecular. The simplest explanation is that MgI2 is ionic, because Mg is an alkali metal, which reacts by losing electrons, and I is a halogen, which reacts by gaining them. 2 K (s) + Mg 2+ (aq) + 2 I-(aq) = 2 K + (aq) + 2 I-(aq) + Mg (s) Net Ionic Equation The balanced net ionic equation includes only species that are involved in the reaction. Answer = SCl6 is Polar What is polarand non-polar? Some people may find it easier to take supplements first thing in the morning, while others may find it easier to take them with dinner or just before bed. Usage of magnesium iodide in the Baylis-Hillman reaction tends to give (Z)-vinyl compounds. Label the polar bonds in each molecule, and then decide if the molecule is polar or nonpolar. These salts are typical ionic halides, being highly soluble in water. The electronic structure of a magnesium ion is the same as that of a neon atom (Ne). Mg (NO3)2 + RbI = MgI2 + Rb (NO3) Net Ionic Equation Magnesium metal forms a doubly charged cation. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. I. A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. Enter an equation of an ionic chemical equation and press the Balance button. This difference results in an electron(s) being transferred from the metal (lower electronegativity) to the non-metal (higher electronegativity). Name the following compounds: 1) KCl potassium chloride. Question = Is SiCl2F2polar or nonpolar ? The chemical compounds with the formula MgI2 and its various hydrates MgI2(H2O)x are known as magnesium iodide. 1 exhibits the ionic conductivities of the electrolytes with LiI, MgI 2, AlI 3, TiI 4, or SnI 4 additives. Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. They can conduct electricity when melted or dissolved in water. So yes, it is a weak acid (NH4+) and weak base (NO2-). chemistry. CH 2 F 2 = Polar. Science; Chemistry; Chemistry questions and answers; 3- Determine whether each compound is ionic or covalent and write the appropriate Lewis structure (4 pts) a- HCN b- CIF c- Mgl2 d- Cas 4- Determine the molecular geometry of each of the following molecules: a- CBr4 b- H2CO c- CS2 d- BH3 e- NO3 (5 pts.) For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. 0. ; Image Credit: Mcardlep / CC BY-SA (Links to an external site.) Is magnesium and iodine ionic (MgI2)? Question = Is C2Cl2polar or nonpolar ? MgI 2 + 2 AgNO 3 = Mg(NO 3) 2 + 2 AgI See Steps to Balance MgI2 + AgNO3 = Mg(NO3)2 + AgI Solubility Equation Determine the state or phase of each substance (gas=g, liquid=l, solid/non-soluble=s, aqueous/soluble=aq) in its undissociated form by . B. Ionic compounds do not exist as molecules. How do you name non-metal ions? [5], Except where otherwise noted, data are given for materials in their, Last edited on 11 February 2023, at 20:18, https://en.wikipedia.org/w/index.php?title=Magnesium_iodide&oldid=1138818648, 637C (1,179F; 910K) (anhydrous, decomposes), This page was last edited on 11 February 2023, at 20:18. Polyatomic ions. 4. mixed bond (not ionic, not covalent). Sodium chloride is an ionic compound. Therefore, neither ion will affect the acidity of the solution so, $KCl$ is a neutral salt. Molecular compounds form covalant bond between atoms. Chemical bonds are formed when a chemical compound is created through the joining of multiple atoms. Name the following compounds: 1) KCl potassium . For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. Since the iodide ion only has a charge of I 1 and there are two iodide ions in the molecule, this informs us that the iron is in the F e+2 oxidation state. 2.32 g/cm 3 (anhydrous) Boiling Point of Magnesium Chloride. MgI 2 + BaS = BaI 2 + MgS See Steps to Balance MgI2 + BaS = BaI2 + MgS Solubility Equation Determine the state or phase of each substance (gas=g, liquid=l, solid/non-soluble=s, aqueous/soluble=aq) in its undissociated form by using the . Magnesium iodide - Wikipedia MgSO4 is a salt formed by a weak base and a strong acid (both dibasic), so there is a two-step hydrolysis of magnesium cation. Juni 2022; Beitrags-Kategorie: xrp fee calculator; Beitrags-Kommentare: . covalent bond. The lattice energy ( Hlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. Directions: Label the following compounds as ionic (I), covalent (C), acid (A) or hydrate (H). They have high melting points. The bonds in PbS are predominantly covalent. Thus NaF is more ionic. In the solid state, ionic compounds are in crystal lattice containing many ions each of the cation and . Different chemical salt form of medicinal agent . In this study, the electrolyte (1M LiTFSI in DME/DOL) with ionic conductivity and viscosity of 12.3 mS cm 1 and 1.74 mPas, respectively, was used as base electrolytes. Magnesium Bromide MgBr2 Molar Mass, Molecular Weight. Magnesium gives two electrons to oxygen as a result of this exothermic reaction, forming powdery magnesium oxide (MgO). This chemical formula says that there are one magnesium ion and two chloride ions in this formula. K + MgI2 = KI + Mg Net Ionic Equation