0.1mol/LCH3COOH0.1mol/LCH3COONa等体积混合,溶液中Na+和CH3COO-浓度那个大?CH3COOH和CH3COO-那个浓度大?
问题描述:
0.1mol/LCH3COOH0.1mol/LCH3COONa等体积混合,溶液中Na+和CH3COO-浓度那个大?
CH3COOH和CH3COO-那个浓度大?
答
CH3COO-浓度大.
一般当弱酸和弱酸盐混合时,考虑电离忽略水解.CH3COONa电离出CH3COO-,所以CH3COO-浓度大.
考虑电离忽略水解后,CH3COONa中CH3COO-完全电离,而CH3COOH也有部分电离生成CH3COO-,所以CH3COO-浓度比CH3COOH浓度大.