题目内容

向体积为Va的0.05 mol/L CH3COOH溶液中加入体积为Vb的0.05 mol/L KOH溶液,下列关系错误的是     (     )   
A.VaVb时:c(CH3COOH)+c(CH3COO)>c(K)
B.VaVb时:c(CH3COOH)+c(H)=c(OH)
C.VaVb时:c(CH3COO)>c(K)>c(OH)>c(H)
D.VaVb任意比时:c(K)+c(H)=c(OH)+c(CH3COO)
C
若醋酸与氢氧化钾等体积混合,两者恰好完全反应生成醋酸钠和水;此时溶液中粒子关系为,电荷守恒:c(K)+c(H)=c(OH)+c(CH3COO),质量守恒:c(CH3COOH)+c(CH3COO)=c(K),质子守恒:c(OH)= c(H) +c(CH3COOH);所以
A正确,VaVb时:醋酸过量,即有c(CH3COOH)+c(CH3COO)>c(K);B正确,VaVb时:由质子守恒得c(CH3COOH)+c(H)=c(OH);C错,VaVb时:KOH过量,c(K)>c(CH3COO)>c(OH)>c(H);D正确,由电荷守恒可得,任意溶液中c(K)+c(H)=c(OH)+c(CH3COO);
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