与化学平衡常数相似,电离平衡的平衡常数,叫做电离常数.电离平衡常数只与温度有关,如在25℃时醋酸的电离平衡常数为:K=C(H+)•C(CH3COO-)C(CH3COOH),H2S存在两步电离,①H2S⇌H++HS- ②HS-⇌
B.Na2S的水解程度远远大于NaHS的水解程度,溶液中HS-的水解程度大于电离程度,所以其溶液呈碱性,则c(H+)<c(OH-),故B错误;C.溶液中存在物料守恒,根据物料守恒得2c(Na+)=3c(S2-)+3c(HS-)+3c(H2S),故C错误;D.根据电荷守恒得c (Na+)+c (H+)=2c (S2-)+c (HS-)+c (OH-),根据物料守恒得2...
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