为了验证NaHCO3固体中是否含有Na2CO3,下列实验及判断中,正确的是:

为了验证NaHCO3固体中是否含有Na2CO3,下列实验及判断中,正确的是:      

A.加热,观察是否有气体放出

B.溶于水后加石灰水,看有无沉淀

C.溶于水后加BaCl2溶液,看有无沉淀  

D.加热后称量,看质量是否变化

答案

C

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