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已知复分解反应:2CH3COOH+Na2CO3═2CH3COONa+H2O+CO2↑可自发进行.在常温下,测得浓度均为0.1mol/L的下列六种溶液的pH:溶质CH3COONaNaHCO3Na2CO3NaClONaCNpH值8.89.711.610.311.1请你判断下列反应不能成立的是
题目详情
已知复分解反应:2CH3COOH+Na2CO3═2CH3COONa+H2O+CO2↑可自发进行.在常温下,测得浓度均为0.1mol/L的下列六种溶液的pH:
溶质 | CH3COONa | NaHCO3 | Na2CO3 | NaClO | NaCN |
pH值 | 8.8 | 9.7 | 11.6 | 10.3 | 11.1 |
A. CO2+H2O+NaClO═NaHCO3+HClO
B. CO2+H2O+2NaClO═Na2CO3+2HClO
C. CH3COOH+NaCN═CH3COONa+HCN
D. CH3COOH+NaClO═CH3COONa+HClO
▼优质解答
答案和解析
A.碳酸酸性大于次氯酸,反应CO2+H2O+NaClO═NaHCO3+HClO能发生,故A正确;
B.酸性H2CO3>HClO>HCO3-,应生成NaHCO3,反应CO2+H2O+2NaClO═Na2CO3+2HClO不能发生,故B错误;
C.CH3COOH酸性大于HCN,反应CH3COOH+NaCN═CH3COONa+HCN能发生,故C正确;
D.醋酸酸性大于次氯酸,反应CH3COOH+NaClO═CH3COONa+HClO能发生,故D正确.
故选B.
B.酸性H2CO3>HClO>HCO3-,应生成NaHCO3,反应CO2+H2O+2NaClO═Na2CO3+2HClO不能发生,故B错误;
C.CH3COOH酸性大于HCN,反应CH3COOH+NaCN═CH3COONa+HCN能发生,故C正确;
D.醋酸酸性大于次氯酸,反应CH3COOH+NaClO═CH3COONa+HClO能发生,故D正确.
故选B.
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