问题 填空题

在河边有A、B、C、D四家工厂向河中排放废水,每个工厂的废水中含有NaOH、HCl、MgCl2、Na2CO3四种物质中的一种。某中学环保小组对该河流的污染状况进行检测,发现:A处河水能使紫色石蕊试液变蓝色;F处河水出现白色浑浊;E处河水有大量气泡产生。试推断:

(1)A工厂排放的废水中含有的污染物是__________________________;

(2)C工厂排放的废水中含有的污染物是__________________________;

(3)E处发生反应的化学方程式为:_______________________________________。

答案

(1)NaOH(或氢氧化钠)

(2)HCl(或

(3)Na2CO3 + 2HCl === 2NaCl + H2O + CO2

阅读理解

阅读理解。

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判断题