This is a balanced chemical equation for the reaction between calcium hydroxide (Ca(OH)2) and phosphoric acid (H3PO4) to form calcium phosphate (Ca3(PO4)2) and water (H2O).

Ca(OH)2 + 2H3PO4 -> Ca3(PO4)2 + 6H2O

This balanced equation shows that one molecule of calcium hydroxide reacts with two molecules of phosphoric acid to produce one molecule of calcium phosphate and six molecules of water.