皮皮学，免费搜题
登录
搜题
【简答题】
海水经过晒盐后得到粗盐和苦卤，重结晶后的食盐中还含有硫酸钠、氯化镁、氯化钙等可溶性杂质，他们在溶液中主要以SO 4 2- 、Ca 2+ 、Mg 2+ 的形式存在，为将这些杂质离子除净，应加入过量的氯化钡、氢氧化钠、碳酸钠等物质将其转化为沉淀，过滤除去；再加入适量的盐酸，得到精盐水，最后经蒸发即得精盐．以下是某化工厂对海水进行综合利用的示意图： （1）在苦卤制镁的过程中加入了石灰乳（主要成分是氢氧化钙），石灰乳是用生石灰制得的，请写出制取石灰乳的化学方程式______． （2）在制备精盐的过程中，氯化钡和碳酸钠溶液的添加顺序是否可以颠倒______，理由是______； （3）在利用粗盐制备精盐过程的第⑥步操作中，加入适量盐酸的目的是______．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．The boss of a big company. B．The police officer. C．The tour guide. D．The chief engineer.
【简答题】国际电气和电子工程师协会的简称是:
【简答题】例1:为扩大影响,増加点击率,T视频分享网站在网上存储了B公司制作并享有著作权的最新电影,供用户免费下载。 例2:某奶粉生产企业为了使本企业的奶粉检时蛋白质含量能够达标,便往牛奶中大量添加三聚氧胺,以致食用该奶粉的上万名几童的健康受损。 例3:Z拍卖公司即将拍卖著名学者Q生前写给某索志主编L的私人信件。该学者的配偶得知后,以该拍卖将侵害著作权和隐私权为由,向法院请求发出诉前禁令,禁止该拍卖活动...
【单选题】What does the police officer finally do?
A.
She took away the man's license.
B.
She gave the man a speeding ticket.
C.
She gave the man a warning,
D.
She asked the man to become familiar with the area.
【简答题】电气和电子工程师协会的英文简称为:( )。
【单选题】The police officer thoroughly ______ the cause of the accident, but they couldn't find any trace.
A.
explored
B.
examined
C.
investigated
D.
analyzed
【简答题】请写出储配站的作用。
【单选题】What does the police officer finally do?
A.
She took away the man's license.
B.
She gave the man a speeding ticket.
C.
She gave the man a warning.
D.
She asked the man to become more familiar with the arm.
【单选题】The police officer asked the children in the street.
A.
not playing
B.
do not play
C.
not to play
D.
not play
【单选题】What did the police officer finally do?
A.
She took away the man's license.
B.
She gave the man a speeding ticket.
C.
She gave the man a warning.
D.
She asked the man to become familiar with the area.
相关题目：