将0.2 mol/L NaF溶液与0.1mol/L稀硝酸等体积混合后,离子浓度的关系

将0.2 mol/L NaF溶液与0.1mol/L稀硝酸等体积混合后,离子浓度的关系正确的是

答案

A、D  


解析:

A选项:NaF+HNO3=NaNO3+HF  HF是弱酸,部分电离

0.1   0.1   0.1  0.1

则溶液中[Na+]0.2 mol/L,[F-]=0.1 mol/L<0.2 mol/L,[NO3-]0.1 mol/L,[H+]<0.1 mol/L 溶液显弱酸性[H+]>[OH-],D选项:由正负离子浓度相等知。

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