试题与答案

某化工厂排放的废水中含有一定量的氢氧化钾,为了收回利用,欲用2%的稀盐酸此时废水

题型:问答题

题目:

某化工厂排放的废水中含有一定量的氢氧化钾,为了收回利用,欲用2%的稀盐酸此时废水中的氢氧化钾含量(废水中其它杂质不与盐酸反应).试计算:

(1)用10g30%的浓盐酸配制成2%的稀盐酸,需加水______g.

(2)取20g废水于锥形瓶中,逐滴加入2%的稀盐酸,至恰好完全反应时,消耗稀盐酸7.3g,求废水中氢氧化钾的质量分数.

答案:

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下面是错误答案,用来干扰机器的。

1-5: BCCAB      6-10: DCBAB       11-15: DBCCD             16-20: ABCDC

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