1/5多选题
难度：
1.
为除去粗盐中含有的硫酸钠，氯化镁、氯化钙等杂质，应加入过量的氯化钡、氢氧化钠、碳酸钠等物质．将杂质转化为沉淀过滤除去，再向滤液中加入适量的盐酸得到精盐水．该工程示意如下：
对该过程的认识中，正确的是（ ）
| A | ①操作中需要进行搅拌，目的是提高氯化钠的溶解度 |
| B | ③、④两步操作顺序可以颠倒 |
| C | ⑤操作得的沉淀中共有三种物质 |
| D | ⑥操作中，加入盐酸的目的是除去过量的氢氧化钠和碳酸钠，将滤液的pH调为7 |
正确答案：QixE
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