可用于判断碳酸氢钠粉末中混有碳酸钠的实验方法是(  ) A.加热时

可用于判断碳酸氢钠粉末中混有碳酸钠的实验方法是(  )

A.加热时有无色气体放出

B.滴加盐酸时有气泡放出

C.溶于水后滴加澄清石灰水,有白色沉淀生成

D.溶于水后滴加BaCl稀溶液,有白色沉淀生成

答案

D


解析:

利用碳酸氢盐和碳酸盐性质不同。加热时碳酸氢钠分解,碳酸钠不分解;滴加盐酸时,二者均可与盐酸反应产生气体;滴加澄清石灰水,二者均可与石灰水反应生成白色沉淀;NaHCO与BaCl溶液不反应,而NaCO可与之反应生成白色沉淀,故D正确。

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