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

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

Part 1: 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 discussion question: To study how many grams of salt can be dissolved in a glass of water, three questions must be solved:

(1) How much water is in a glass of water?

(2) How to add salt?

(3) How to determine the maximum amount of salt that water can dissolve?

Research plan: (1) Clarify the research question.

How many grams of salt can be dissolved in 100 ml of water?

(2) Implement experimental preparations.

Measuring cylinder, transparent glass, scale, small spoon, stirring rod, salt, record sheet, etc.

(3) Design experimental research methods

Use a measuring cylinder to take 100 ml of water and pour it into a clear glass.

Use a scale to divide the salt into 2-gram portions and prepare several portions.

Put the salt into the glass one by one, wait until the first portion is completely dissolved, then add the second portion until it is difficult to dissolve.

Record the amount of salt added and complete the experiment record sheet.

In summary, how to conduct an experiment to study how many grams of salt can be dissolved in 100 ml of water?

How many grams of salt can be dissolved in 100 ml of water PPT, Part 2 content: Classroom questions

1. Judgment questions

1. There is a certain limit to the dissolution of substances in water. ( )

2. How many grams of salt can be dissolved in 100 ml of water depends on whether it is stirred. ( )

3. Do not let water spill out when stirring or shaking during the dissolution process. ( )

4. How many grams of salt can be dissolved in 100 ml of water? A graduated cylinder and a balance are required in the experiment. ( )

2. Multiple choice questions

(1) When studying "how many grams of salt can be dissolved in a cup of 100 ml of water", the more reasonable method of adding salt to water is ( )

A Add 2g 2g first, then 5g 5g B Pour a large bag of salt into the cup at one time C Add 2g each time

(2) When doing the experiment of "How many grams of salt can be dissolved in a cup of 100 ml of water?", the process that will not be experienced is ( )

A filter B heat C stir

(3) A bucket of water can dissolve more sugar than a small cup. This shows that ( )

A White sugar has strong dissolving ability in a bucket of water

B White sugar has strong dissolving ability in a small cup of water

C The solubility of sugar in both types of water is the same, but the more water, the greater the amount dissolved.

(4) Among the following questions, we can directly study which one ( )

A How many grams of sugar can be dissolved in a cup of water B How many grams of sugar can be dissolved in 100 ml of water

C None of the above are possible

3. Short answer questions

1. If there is some undissolved substance at the bottom of the cup, we say this substance is insoluble in water, right? Why?

No, because it is possible that the solution has reached the maximum solubility, and at this time there will be some cases where the powder of the substance is not dissolved.

2. How many grams of salt can be dissolved in 100 ml of water? Does it matter whether it is stirred or not? Why?

It doesn't matter, because stirring can only speed up the dissolution of salt, but cannot increase the amount of salt dissolved.

How many grams of salt can be dissolved in 100 ml of water PPT, Part 3 content: Class summary

1. A certain amount of water can only dissolve a certain amount of salt. There is a limit to the amount of salt that can be dissolved in 100 ml of water, which is about 36 grams.

2. Add salt, stir, and wait until all the salt is dissolved before adding the next portion. After several times, stop when you find that the salt is no longer dissolved.

3. The salt particles should be uniform and consistent in size. Do not spill water when stirring or shaking during the dissolution process.

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Update Time: 2024-09-02

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