.../L的醋酸溶液中不断滴入0.1 mol/L的NaOH溶液,溶液的pH变化曲线如图所...
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发布时间:2024-10-02 19:38
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时间:2024-10-22 17:05
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a点时,二者反应后相当于等浓度的CH 3 COOH与CH 3 COONa溶液,由于酸的电离大于盐的水解,故: c (CH 3 COO - )> c (Na + ) c (CH 3 COOH) > c (H + ) > c (OH - );
b点时正好呈中性,由电荷守恒可知正确;c点时,二者反应后即是CH 3 COONa溶液,电荷守恒: c (Na + ) + c (H + )= c (CH 3 COO - ) + c (OH - ) ①,物料守恒: c (Na + ) = c (CH 3 COOH) + c (CH 3 COO - ) ②,将②代入①式可知: c (OH - )= c (H + )+ c (CH 3 COOH);d点时,二者反应后相当于等浓度的NaOH与CH 3 COONa溶液,根据物料守恒和电荷守恒即可得出: c (Na + ) > c (OH - ) > c (CH 3 COO - ) > c (H + )