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简答题写出下列酸碱组分的MBE、CEB和PBE(设定质子参考水准直接写出),浓度为 c(mol·L-1)。 (1)KHP (2)NaNH4HPO4 (3)NH4H2PO4 (4)NH4CN
  • (1)MBE://[K+]=c
    [H2P]+[HP-]+[P2-]=c
    CBE://[K+]+[H+]=2[P2-]+[OH-]+[HP-]
    PBE://[H+]+[H2P]=[P2-]+[OH-]
    (2)MBE://[Na+]=[NH4+]+[NH3]=c
    [H2PO4-]+[H3PO4]+[HPO42-]+[PO43-]=c
    CBE://[Na+]+[NH4+]+[H+]=[OH-]+[H2PO4-]+2[HPO42-]+3[PO43-]            
    PBE://[H+]+[H2PO4-]+2[H3PO4]=[OH-]+[NH3]+[PO43-]       
    (3)MBE://[NH4+]+[NH3]=c
    [H3PO4]+[H2PO4-]+[HPO42-]+[PO43-]=c
    CBE://[NH4+]+[H+]=[H2PO4]+2[HPO42-]+3[PO43-]+[OH-]          
    PBE://[H+]+[H3PO4]=[OH-]+[NH3]+[HPO42-]+2[PO43-]       
    (4)MBE://[NH4+]+[NH3]=c                  
    [CN-]+[HCN]=c
    CBE://[NH4+]+[H+]=[OH-]+[CN-]            
    PBE://[HCN]+[H+]=[NH3]+[OH-]
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