"Method of Separating Salt and Water" Dissolution PPT Courseware 2

Description

"Method of Separating Salt and Water" Dissolution PPT Courseware 2

There is still undissolved salt in the beaker on the left. What method can be used to dissolve the salt?

Observation: The concentrated salt water left over from the previous class

Thinking: Why is there salt at the bottom of the cup?

Is there a way to keep the salt dissolved at the bottom of the cup?

Use a piece of paper to mark the level of concentrated salt water on the wall of the cup, and then add water little by little until all the salt in the cup is dissolved.

Experimental safety matters

1. Precautions for operating the alcohol lamp:

1. Operating specifications - the use of alcohol lamps;

The flame of the alcohol lamp can be divided into three layers: outer flame, inner flame and flame core. The temperature of the outer flame is the highest and the temperature of the flame core is the lowest. When using it, use the outer flame of the alcohol lamp to heat the object.

2. Use matches to light the alcohol lamp. Do not use the alcohol lamp to directly point the fire. When extinguishing a fire, use the cap of the alcohol lamp to extinguish the alcohol lamp. Repeat the process after the cap is extinguished to prevent the cap from being unable to open during future use. It is absolutely forbidden to blow out fire with your mouth!

2. Extinguish the alcohol lamp before the salt water has completely evaporated.

3. The heated evaporating dish, tripod, and asbestos net are very hot, so do not touch them.

Experimental reminder

Extinguish the alcohol lamp before the salt water has completely evaporated.

The heated evaporating dish, tripod, asbestos net, etc. will still be very hot for a long time, so pay attention to safety!

After the experiment is completed, clean the equipment and communicate the results of the experiment.

Summary

The change of salt dissolution in water is a reversible process, and the salt dissolved in water can be separated by evaporation.

People took advantage of this characteristic of salt to introduce seawater into salt fields, use the heat of the sun to evaporate the water in the seawater, and finally precipitate salt crystals.

Where does the salt in life come from?

According to the source of raw materials, it can be divided into sea salt, lake salt and mine salt.

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For more information about the PPT courseware "Methods to Dissolve and Separate Salt and Water", please click the "Methods to Dissolve and Separate Salt and Water" ppt tag.

"Method of Separating Salt and Water" Dissolution PPT Download:

"Method of Separating Salt and Water" Dissolution PPT download Part 1: Will salt and water evaporate together? Experimental purpose: to verify whether salt and water evaporate together. Experimental materials: 1 cup of concentrated salt water, 1 cup of clean water. Experimental steps: (1) Dissolve the salt at the bottom of the cup. ..

"Method of Separating Salt and Water" Dissolve PPT:

"Methods to Separate Salt and Water" Dissolution PPT Part 1: Will salt and water evaporate together? Observe the concentrated salt water we collected in the experiment. There is still undissolved salt at the bottom of the cup. Use a pen to mark the level of concentrated salt water. Add water little by little..

"Methods for Separating Salt and Water" Dissolution PPT Courseware 6:

"Method of Separating Salt and Water" Dissolution PPT Courseware 6 Step 1: Hold the lamp pot with your left hand and open the lamp cap with your right hand upwards Step 2: Use a match to light the alcohol lamp (bottom up) Step 3: Use external flame to heat (The outer flame temperature is the highest) Step 4: Cover the lamp cap and extinguish the alcohol..

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Update Time: 2024-11-22

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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