试题与答案

工业上向氨化的CaSO4悬浊液中通入适量CO2,可制取(NH4)2SO4,其流程

题型:填空题

题目:

工业上向氨化的CaSO4悬浊液中通入适量CO2,可制取(NH4)2SO4,其流程如下图所示,已知CaSO4的Ksp=9.1×10-6,CaCO3的Ksp=2.8×10-9,请回答:

(1)向甲中通入过量CO2_____(填“有”或“不”)利于CaCO3和(NH4)2SO4的生成,原因是_______________________________________________________________。

(2)直接蒸干滤液得到的(NH4)2SO4主要含有的杂质是________(填含量最多的一种)。

(3)锅炉水垢中含有的CaSO4,可先用Na2CO3溶液浸泡,使之转化为疏松,易溶于酸的CaCO3,而后用酸除去。

①CaSO4转化为CaCO3的离子方程式为____________________________________。

②请分析CaSO4转化为CaCO3的原理:__________________________________________。 

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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The right order is: 1______ 2______ 3______ 4______ 5______

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