a) i) Molecular:
H3PO4 + Ca (OH) 2 = CaH2PO4 + H2O + OH-
Net ionic:
2 H + (aq) + PO4-3 (aq) + Ca + 2 (aq) + = CaH2PO4 (aq)
ii) H2PO4- + 2 Ca (OH) 2 = Ca2HPO4 + H2O + 3 OH-
2 Ca + 2 (aq) + H + (aq) + PO4-3 (aq) = Ca2HPO4 (aq)
iii) 2 HPO4-2 + 3 Ca (OH) 2 = Ca3 (PO4) 2 + 2 H2O + 4 OH-
3 Ca + 2 (aq) + 2 PO4-3 (aq) = Ca3 (PO4) 2 (s)
b) The successive reaction is:
H3PO4 = H2PO4- + H + = HPO4-2 + H + = PO4-3 + H +
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