Na2HPO4的质子平衡式怎么写,

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Na2HPO4
电荷守恒,[Na+]+[H+]=[OH-]+[H2PO4-]+2[(HPO4)2-]+3[(PO4)3-]
物料守恒,[Na+]=2[(PO4)3-]+2[(HPO4)2-]+2[H2PO4-]+2[H3PO4]
质子守恒,[OH-]+[(PO4)3-]=[H2PO4-]+2[H3PO4]+[H+]