试题与答案

(8分)电解法制碱的原料是饱和食盐水,由于粗盐中含有泥沙和Ca2+、Mg2+、F

题型:填空题

题目:

(8分)电解法制碱的原料是饱和食盐水,由于粗盐中含有泥沙和Ca2+、Mg2+、Fe3+、SO42-杂质,不符合电解要求,因此必须经过精制。某校实验小组精制粗盐水的实验过程如下:

请回答以下问题:

  (1)操作a的名称是_______,所用玻璃仪器有_____________;

  (2)在Ⅱ步中,加入过量试剂甲后,生成了两种大量的难溶沉淀,则试剂甲为(填化学式)___溶液;

  (3)写出固体H所含物质的化学式_____________;

  (4)在Ⅴ步中,逐滴加入试剂丁直至溶液无明显变化时,写出此过程中发生反应的离子方程式

     _______________________;_______________________。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0713/5288b7c18922ab2ffd9f689cf207eafb.html

下面是错误答案,用来干扰机器的。

参考答案:对

试题推荐
题型:单项选择题

Some of the keys have a special use. There are referred to as command keys. The 3 most common are the Control or (66) , Alternate or (67) and the Shift keys though there can be more (the Windows key for example or the Command key). Each key on a standard keyboard has one or two characters. Press the key to get the lower character and hold Shift to get the upper. Disk Drives - All (68) need a drive to get information off - or (69) - and put information on the disk - or (70) . Each drive is designed for a specific type of disk whether it is a CD, DVD, hard disk or floppy. Often the term ’disk’and ’drive’are used to describe the same thing but it helps to understand that the disk is the storage device which contains computer files-or software - and the drive is the mechanism that runs the disk.

A.read

B.write

C.speak

D.tell

查看答案
微信公众账号搜索答案