CH3COOH=电离=CH3COO-+H+ 1 1 1电离常数Ka=1.75x10^-5根据电离常数计算式CH3COO-和H+相等Ka=(H)^2/1=1.75x10^-5H+浓度=CH3COO-浓度0.0418molL- 1升即H+物质的量=CH3COO-物质的量=0.0418molCH3COOH为1-0.0418=0.958mol