"Seawater "Sun Salt"" Chemistry in seawater PPT download

Description

"Seawater "Sun Salt"" Chemistry in Seawater PPT download, 29 pages in total.

learning target

1. Know that evaporation and crystallization is the basic principle of seawater sun salt.

2. Learn to use recrystallization to remove sediment from coarse salt.

3. Understand the methods of refining table salt.

4. Master the general ideas and methods of mixture separation.

The process of "salting" sea water

think:

1. In the above process, what is the path for the sodium chloride solution to change from unsaturated to saturated? How can you tell whether a solution is saturated?

2. If you were the decision-maker of a salt farm, what natural conditions do you think are conducive to seawater salt production?

3. Through the sodium chloride solubility curve, think about why evaporation crystallization is used to extract salt instead of cooling crystallization?

Purification of coarse salt

Remove the poorly soluble nature of coarse salt

What method can be used to remove sediment from coarse salt?

[Thinking] In the purification of crude salt: what instruments are used for dissolution, filtration, and evaporation operations, and what roles do they play?

①Dissolution: Stir to accelerate dissolution

②Filtration: drainage to prevent liquid from splashing

③Evaporation: Make the liquid heat evenly and prevent excessive local temperature from boiling

practice

1. The following can be separated according to the order of dissolution, filtration, and evaporation ( )

A.Water and alcohol B.Potassium nitrate and sodium chloride

C. Coarse salt (containing sediment) D. Calcium carbonate and copper oxide

2. In order to remove Ca2+, Mg2+, SO42 and mud in the coarse salt, the coarse salt can be dissolved in water, and then the following five operations are performed: ① filter; ② add excess NaOH solution; ③ add appropriate amount of hydrochloric acid; ④ add excess Na2CO3 solution; ⑤ Add excess BaCl2 solution. The most appropriate sequence of operations below is ( )

Keywords: free download of PPT courseware for the ninth grade of the May 4th Lujiao version of chemistry, seawater sun salt PPT download, chemistry in seawater PPT download, .PPT format;

For more information about the PPT courseware "Chemistry of Seawater and Seawater Salt", please click on the Chemistry of Seawater PPT Seawater Salt PPT tab.

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Update Time: 2024-10-19

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 2 industry PPT template

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