Explanation:
1) When phosphoric acid reacts with calcium hydroxide neutralization reaction takes place in which calcium phosphate is formed along with formation of water.
The balanced chemical equation is give as:
[tex]2H_3PO_4+3Ca(OH)_2\rightarrow Ca_3(PO_4)_2+6H_2O[/tex]
2) When calcium oxide acid reacts with phosphorus pentoxide addition reaction takes place in which calcium phosphate is formed.
The balanced chemical equation is give as:
[tex]3CaO+P_2O_5\rightarrow Ca_3(PO_4)_2[/tex]
