"Quantitative Expression of Solution Composition" Solution PPT

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"Quantitative Expression of Solution Composition" Solution PPT, 18 pages in total.

1. Course introduction

Are the copper sulfate contents in the three test tubes the same?

2. Expression method of solution composition

Activity world

1. Add 8.0 g sucrose to 40 mL of water and stir to dissolve the sucrose.

2. Add 10.0 g sucrose to a bottle containing 50 mL of water, and stir to dissolve the sucrose.

think:

1. Of the two cups of sugar water obtained above, which one is sweeter? What is the basis for your judgment?

2. If your conclusion is obtained through calculation, are the calculation formulas you listed the same as those of other students?

Formula Derivation

Mass of solute = mass of solution × mass fraction of solute

Solution mass = mass of solute ÷ solute mass fraction

3. Calculations related to solution composition

Example 1. In agricultural production, it is often necessary to use a sodium chloride solution with a mass fraction of 16% for seed selection. To prepare 150 kg of this solution, what mass of sodium chloride and water are needed?

Example 2: To prepare 500 mL of sodium hydroxide solution with a mass fraction of 10% (density 1.1g/cm3), what is the mass of sodium hydroxide and water required?

4. Methods for preparing solutions with a certain solute mass fraction

Instruments used: pallet balance, beaker, measuring cylinder, medicine spoon.

step 1. Calculation 2. Weighing (measurement) 3. Dissolve 4． bottling

5. Practice in class

To 40 grams of an unsaturated solution of potassium nitrate with a solute mass fraction of 15%, add 10 grams of potassium nitrate or 10 grams of water, and calculate the mass fraction of the solute in the resulting solution.

6. Class Summary

1. The composition of a solution can be expressed quantitatively by the mass fraction of the solute.

Mass fraction of solute = mass of solute/mass of solution × 100%

2. Solution dilution, concentration

The mass of the solute remains unchanged before and after dilution.

3. Solution preparation steps:

(1) Calculate (2) Weigh (measure) (3) Dissolve (4) Bottle

Keywords: Free download of Chemistry PPT courseware for the ninth grade of Lujiao Edition, PPT download, .PPT format;

For more information about the "Quantitative Representation of Solution Compositions" PPT courseware, please click on the "Quantitative Representation of Solution Compositions PPT" tab.

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Update Time: 2024-10-16

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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