单项选择题
A.1摩尔/升HAc+1摩尔/升NaAc B.1摩尔/升HAc+1摩尔/升NaCl C.1摩尔/升HaC+1摩尔/升NaOH
A.C（HAC.=0.02摩尔/升溶液 B.C（HAC.=0.02摩尔/升与C（NaAC.=0.02摩尔/升等体积混合液 C.C（HAC.=0.02摩尔/升与C（NaOH）=0.02摩尔/升等体积混合液
A.沉淀减少 B.沉淀不变 C.沉淀增加