常温下将0.010molCH3COONa和0.004molHCl溶于水,配制成0.5L混合溶液,判断: (1)溶液中有两种微粒的物质的量之和一定等于0.010mol,它们是_ 和_; (2)溶液中n(CH3COO-)+n(OH-)-n(H+
问题描述:
常温下将0.010molCH3COONa和0.004molHCl溶于水,配制成0.5L混合溶液,判断:
(1)溶液中有两种微粒的物质的量之和一定等于0.010mol,它们是______ 和______;
(2)溶液中n(CH3COO-)+n(OH-)-n(H+)=______mol.
答
(1)根据物料守恒可知,0.010mol CH3COONa在溶液中以CH3COOH和CH3COO-存在,n(CH3COOH)+n(CH3COO-)=0.010mol,
故答案为:CH3COOH;CH3COO-;
(2)溶液遵循电荷守恒,存在:n(H+)+n(Na+)=n(Cl-)+n(CH3COO-)+n(OH-),
则n(CH3COO-)+n(OH-)-n(H+)=n(Na+)-n(Cl-)=0.010mol-0.004mol=0.006mol,
故答案为:0.006;