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"Method of Separating Salt and Water" Dissolution PPT Courseware 3
Observation: A cup of concentrated salt water
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.
Place the cup on the windowsill and let the water evaporate. When the water level in the cup drops to its original level, what will happen to the dissolved salt?
If the water in the cup continues to evaporate and decrease day by day, until all the water is evaporated, what will happen to the salt that was originally dissolved in the water? Will the salt evaporate with the water or remain in the cup?
Precautions for using alcohol lamp:
1. Check whether the wick is flat and the amount of alcohol in the bottle. The volume of alcohol in the lamp should be greater than 1/4 and less than 2/3 of the volume of the alcohol lamp.
2. Use a burning match or wooden stick to ignite. It is absolutely prohibited to use an alcohol lamp to ignite another alcohol lamp.
3. After using up the alcohol lamp, you must cover it with the lamp cap and do not blow it out with your mouth (you need to cover it twice)
4. If the spilled alcohol burns on the table, don’t panic and cover it immediately with a wet rag.
Salt will not evaporate with water. The color, shape and size of the separated white particles are close to those of salt. The white particles can be dissolved in water when put into water. The white particles are the original dissolved salt.
What we found:
Salt can be dissolved in water and separated from water.
Extracurricular exploration:
1. What applications does this characteristic of salt have in life?
2. Will sugar, MSG, and potassium permanganate cause this?
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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..