用可溶性钡盐检验SO42-离子的存在时,先在待测溶液中加入盐酸,其

用可溶性钡盐检验SO42-离子的存在时,先在待测溶液中加入盐酸,其作用是 (    )

A.形成较多的白色沉淀                      B.形成的沉淀纯度更高

C排除SO42-以外的其它阴离子及Ag+的干扰 D.排除Ba2+以外的其它阳离子的干扰

答案

C

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