1. The problem statement, all variables and given/known data Find the total ionic (balanced) equation of the reaction of calcium hydroxide and phosphoric acid in aqueous solution. 2. Relevant equations Solubility rules 3. The attempt at a solution First, I balanced the reaction. 3Ca(OH)2 + 2H3PO4 --> Ca3(PO4)2 + 6H2O The part I'm stuck at is I dont know what to break up and what to leave. I know the solubility rules, but for some reason I keep getting this question wrong. I know that Ca(OH)2 can break up into 3Ca2+ + 6OH- But is that the only one that breaks up? I looked it up and I'm getting mixed results. Please help me if you can. Thanks in advance.