setarakan persamaan reaksi berikut :
a.) CaCl2 + (NH4)3PO4 = Ca3(PO4)2 + NH4Cl
b.) Ca(OH)2 + H3POt4 = Ca3(PO4)2 + H2O
c.) SiO + CaF2 + H2SO4 = CaSO4 + SiF4 + H2O
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