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(Ca²⁺)₂P₂^4-, or Ca₂P₂. Since the bonding is ionic, the diphosphide centers carry negative charge and are easily protonated. Upon hydrolysis this material releases diphosphine (P₂H₄):
:Ca₂P₂ + 4 H₂O -> 2 Ca(OH)₂ + P₂H₄The hydrolyses of CaP and calcium carbide (CaC₂) are similar, except that diphosphine

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