IONIC EQUATIONS.pptx easy steps to follow

great resource for writing ionic equations and to increase practice

1. IONIC EQUATIONS FORM: 4 Ms.Levy

2. Solubility Rule of compounds: In equations, if the compound is soluble, it would usually be given the state symbol ( aq ). If it is insoluble it would always be given the state symbol (s). Most ionic compounds are soluble in water; however, some are insoluble.

3. Compounds that are soluble vs Insoluble

4. Writing Ionic Equations Ionic equations show only the atoms or ions which actually take part in the reaction and, as a result, end up in a different state from the one in which they started. For example, Two ions in solution may join to form an insoluble compound within the solution, known as a precipitate. Two ions may form a covalent compound composed of molecules An ion may be converted to an atom, ie . It may be discharged An element in its free state may be converted to an ion, ie ; it may be ionized.

5. Steps used when writing ionic equations 1. Write the balanced chemical equation for the reaction Rewrite the equation, but show any ions that are present in solution as individual ions Delete any ions which remain unchanged, ie . Which are in solution on both sides of the equation. These are called spectator ions and they do not take part in the reaction. Rewrite the ionic equation showing only the atoms or ions which change, ie . Those which actually take part in the reaction. Cancel the coefficients to the lowest possible ratio if necessary.

6. Key point to note: When acids, such as hydrochloric acid ( HCl ), nitric acid (HNO3) and sulfuric acid (H2SO4) are in aqueous solution they ionize to form hydrogen, H+ ions and negative anions.

7. Examples: Write the ionic equations for the reaction: between lead nitrate solution and sodium chloride solution to produce insoluble lead chloride and sodium nitrate. Between potassium hydroxide and sulfuric acid (H2SO4) to produce potassium sulfate and water. Between magnesium and hydrochloric acid ( HCl ) and to produce magnesium chloride and hydrogen gas.