试题与答案

气与血的关系是怎样的?

题型:问答题 简答题

题目:

气与血的关系是怎样的?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:对

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题型:计算题

(3分)氯化钙钾石的化学式为KCl·xCaCl2(x是CaCl2的系数)。它是一种钾肥,溶于水后得到KCl和CaCl2的混合溶液。某化学兴趣小组为了测定氯化钙钾石中钾元素的质量分数,称取样品18.55g加水完全溶解得到KCl与CaCl2的混合溶液210g,向该溶液中逐滴加入Na2CO3溶液,产生的沉淀与加入Na2CO3溶液的质量关系如下图所示。

已知:Na2CO3 + CaCl2=CaCO3↓ + 2NaCl

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(1)氯化钙钾石中钾元素的质量分数。

(2)B点时溶液中Na2CO3的质量分数。

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