用离子加中括号表示离子浓度
Na2S
电荷守恒,[Na+]+[H+]=[OH-]+2[S2-]+[HS-]
物料守恒,[Na+]=2[S2-}+2[HS-]+2[H2S]
质子守恒,[OH-]=[H+]+[HS-]+2[H2S]
Na3PO4
电荷守恒,[Na+]+[H+]=[OH-]+[H2PO4-]+2[(HPO4)2-]+3[(PO4)3-]
物料守恒,[Na+]=3[(PO4)3-]+3[(HPO4)2-]+3[H2PO4-]+3[H3PO4]
质子守恒,[OH-]=[(HPO4)2-]+2[H2PO4-]+3[H3PO4]+[H+]
NaHCO3
电荷守恒,[Na+]+[H+]=[HCO3-]+2[(CO3)2-]+[OH-]
物料守恒,[Na+]=[(CO3)2-]+[HCO3-]+[H2CO3]
质子守恒,[OH-]+[(CO3)2-]=[H+]+[H2CO3]
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+]