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separates the molten ionic compound into its elements. The reactions at each electrode are called half equations. The half equations are written so that the same number of electrons occur in each equation. Pb 2+ + 2e- Pb (lead metal at the (-)cathode). 2Br- - 2e- Br 2 (bromine gas at the (+)anode). Title: Net ionic equations 1 Net ionic equations S2 PO43 Na 2Ca2 3Cl Al3 2 Review forming ions. Ionic (i.e. salt) refers to ve ion plus -ve ion ; Usually this is a metal non-metal or metal polyatomic ion (e.g. NaCl, NaClO3, Li2CO3) Polyatomic ions are listed on page 95 (aq) means aqueous (dissolved in water) For salts (aq) means the salt exists ... Nov 04, 2019 · Make sure there are equal numbers of each type of atom on both sides of the equation. Make sure the overall charge is the same on both sides of the ionic equation. If the reaction takes place in a basic solution, add an equal number of OH-as you have H + ions. Do this for both sides of the equation and combine H + and OH-ions to form H 2 O.