A溶液PH增加.
CH3COOH溶液加水稀释,醋酸被稀释,氢离子浓度变小,PH变大;
CH3COOH溶液加加入少量CH3COONa晶体,其实也是酸溶液中加入碱使氢离子浓度变小,PH变大.或者用醋酸根水解,增加了氢氧根浓度,解释都可以.