某化學(xué)興趣小組同學(xué)用Na2CO3溶液和濃HCl來研究簡易滅火器的反應(yīng)原理時,對廢液的成分進(jìn)行探究。

【推理假設(shè)】  廢液的成分中一定有               ,可能有Na2CO3或鹽酸.

【實驗探究】  確定廢液成分中是否含有Na2CO3或鹽酸

     請你協(xié)助興趣小組的同學(xué)完成實驗探究,并完成實驗報告。

實驗步驟

現(xiàn)象

結(jié)論

該廢液中一定沒有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

該廢液中一定含有Na2CO3


            NaCl          

實驗步驟

現(xiàn)象

結(jié)論

取樣于試管中,滴加石蕊試液,振蕩,觀察現(xiàn)象

溶液不變紅色

該廢液中一定沒有鹽酸                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

另取樣于試管中,滴加稀鹽酸,觀察現(xiàn)象

有氣泡產(chǎn)生

該廢液中一定含有Na2CO3

(答案合理即可)


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