"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT Courseware 4

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"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT Courseware 4

group discussion

1. How to conduct experiments to study this problem? What should we pay attention to?

2. Is the same amount of salt dissolved in cups of different sizes?

3. When should the second spoonful of salt be added? What about the third spoonful?

4. When should you stop adding salt?

5. How do you know that the salt is completely dissolved?

Observe and think

1. Add 1 teaspoon of salt to the beaker of water and stir. What do you see?

2. If you add 1 teaspoon of salt and stir, will it still dissolve?

3. What will happen if you keep adding salt and stirring to this glass of water?

4. Analysis:

A. Is there a limit to how much salt can dissolve in a glass of water?

B. How to judge if it cannot be dissolved?

C. If the amount of water is different, will the amount of dissolved salt change?

Activity tips

Method 1: First divide the salt into 2 grams a portion, and then add it to the water one by one until it cannot be dissolved. Calculate how many portions of salt you have added, and you will know how many grams it is. Or give the group 40 grams of salt, divided equally into 20 portions, each portion is about 2 grams.

Method 2: Flat spoon quantitative method. Just use a small spoon to hold a spoonful of salt, use a toothpick or glass rod to scrape off the excess salt, and weigh the mass of a flat spoonful of salt. You will know how many grams of salt you have added. (Easy to operate, but the strength and depth of scraping will be different, and there are problems such as spilling the salt.)

Method 3: Use a balance to weigh the mass of the beaker containing 100 ml of water, recorded as A gram; during the experiment, just add salt to the water until the salt cannot dissolve, and then weigh the total mass, recorded as B gram. Then the mass of salt added is B-A grams. (It is more rigorous, but there is no limit to adding salt. If you add a lot at once, it will be too much, and the error will be large.)

Extend the experiment:

Approximately how many grams of sugar can be dissolved in 100 ml of water?

Approximately how many grams of MSG can be dissolved in 100 ml of water?

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"How many grams of salt can be dissolved in 100 ml of water" dissolving PPT:

"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT Part 1 Content: How many grams of salt can be dissolved in 100 ml of water 1. Experimental plan to study how many grams of salt can be dissolved in 100 ml of water Determine the question to be discussed: To study how much can be dissolved in a glass of water grams of table salt, must...

"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT Courseware 3:

"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT courseware 3 Observation and thinking 1. Add 1 teaspoon of salt to the beaker containing water, stir, what do you see? 2. If you add 1 teaspoon of salt and stir, will it still dissolve? 3. What will happen if you keep adding salt to this glass of water and stirring it...

"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT courseware 2:

"How many grams of salt can be dissolved in 100 ml of water" Dissolution PPT courseware 2 requires experiments to verify. Use data to illustrate. Different substances have different dissolving abilities in water. So how big is the dissolving ability of a substance in water? Can I use exact data...

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Update Time: 2024-09-30

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