试题与答案

氯碱厂电解饱和食盐水制取NaOH的工艺流程示意图如下 依据上图,完成下列填空:

题型:实验题

题目:

氯碱厂电解饱和食盐水制取NaOH的工艺流程示意图如下

依据上图,完成下列填空:

(1)在电解过程中,与电源正极相连的电极上所发生反应的化学方程式为_______________________,与电源负极相连的电极附近,溶液pH值_____________(选填:不变、升高或下降)

(2)工业食盐含Ca2+、Mg2+等杂质。精制过程发生反应的离子方程式为_______________________,

_______________________。

(3)如果粗盐中SO42-含量较高,必须添加钡式剂除去SO42-,该钡试剂可以是___________(选填a、b、c,多选扣分)

a、Ba(OH)2  b、Ba(NO3)2  c、BaCl2

(4)为有效除去Ca2+、Mg2+、SO42-,加入试剂的合理顺序为____________(选填a,b,c多选扣分)

a、先加NaOH,后加Na2CO3,再加钡试剂      

b、先加NaOH,后加钡试剂,再加Na2CO3

c、先加钡试剂,后加NaOH,再加Na2CO3

(5)脱盐工序中利用NaOH和NaCl在溶解度上的差异,通过__________、冷却、___________(填写操作名称)除去NaCl

(6)在隔膜法电解食盐水时,电解槽分隔为阳极区和阴极区,防止Cl2与NaOH反应;采用无隔膜电解冷的食盐水时,Cl2与NaOH充分接触,产物仅是NaClO和H2,相应的化学方程式为______________________

答案:

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