求0.1mol/L CH3COOH溶液的PH值?若将此溶液加水稀释1000倍,则PH 值变为多少?(Ka=1.8*10-5)
问题描述:
求0.1mol/L CH3COOH溶液的PH值?若将此溶液加水稀释1000倍,则PH 值变为多少?(Ka=1.8*10-5)
答
c(H+)=根号下Ka*c(CH3COOH)=根号下1.8*10-5*0.1=根号下1.8*10-6=?
pH=-lgc(H+)
加水稀释1000倍后算出c(H+),然后再求pH.