P---->Ca3P2---->PH3--->H3PO4--->Ca3(PO4)2---->Ca(HPO4)2
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Ca3P2 + H2O = Ca(OH)2 + PH3
PH3 + KMnO4 + H2SO4 = P2O5 + K2SO4 + MnSO4 + H2O
P2O5 + KOH = K3PO4 + H2O
K3PO4 + CaCl2 = KCl + Ca3(PO4)2
Ca3(PO4)2 + H3PO4 = Ca(H2PO4)2