Question

当pH＝5.00时,计算0.10 mol•L-1二元弱酸H2A中,HA-离子的浓度（mol•L-

Answer 1

[A2-]=0.10{Ka1Ka2/(Ka1Ka2+Ka1[H+]+[H+]^2)}

[HA-]=0.10{Ka1[H+]/(Ka1Ka2+Ka1[H+]+[H+]^2)}

[H2A]=0.10{[H+]^2/(Ka1Ka2+Ka1[H+]+[H+]^2)}

将氢离子浓度,和各平衡常数代入上述各式即得结果.