We will treat PO 4 group (note that to be correct we should treat it as a ion, which we will neglect at the moment in notation) as one large entity (we will make it bold so that it will be easier to spot):ĬaCO 3 + H 3 PO 4 → 1Ca 3( PO 4) 2 + H 2O + CO 2 Obviously the most complicated molecule - one that we will start with - is that of calcium phosphate, so let's assume there is one such molecule in the balanced equation:ĬaCO 3 + H 3PO 4 → 1Ca 3(PO 4) 2 + H 2O + CO 2 We will use it to balance equation of reaction between calcium carbonate and phosphoric acid:ĬaCO 3 + H 3PO 4 → Ca 3(PO 4) 2 + H 2O + CO 2
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