已知氯水中存在反应:Cl2+H2O     H++Cl-+HClO,取5 mL饱和氯

 


已知氯水中存在反应:Cl2H2O     H+ClHClO,取5 mL饱和氯水进行如下实验。下列说法中,正确的是

A5 mL水,c (H+)增大                B.加少量NaCl固体,c (H+)不变

C.加少量碳酸钙粉末,c(HClO)升高        D.加少量Na2SO3体,溶液pH升高

答案

【答案】C

【解析】

试题分析:A5 mL水是稀释,c (H+)减小,故A错误; B.加少量NaCl固体,c (Cl-)增大,平衡向左移动,c (H+)减小,故B错误;C.加少量碳酸钙粉末,能与H+反应,促进平衡右移,c(HClO)升高,故C正确;D.加少量Na2SO3固体,Cl2氧化Na2SO3得到硫酸钠和HCl,溶液pH降低,故D错误,答案为C

考点:考查平衡的影响因素与移动  

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