"Formation of Solution" Solution PPT Courseware (Lesson 2)

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"Formation of Solution" Solution PPT Courseware (Lesson 2), 20 pages in total.

new knowledge learning

Knowledge point 1: Judgment between saturated solution and unsaturated solution

1. Observe whether potassium nitrate can dissolve infinitely in a certain amount of water

(1) In a beaker containing 20 mL of water, add 5 g of potassium nitrate and stir thoroughly until all the potassium nitrate is dissolved.

(2) Add 5 g of potassium nitrate to the solution obtained above and stir thoroughly until the potassium nitrate is partially dissolved.

2. Saturated solution and unsaturated solution

Under a certain ______, a solution in which ______ continues to dissolve potassium nitrate is called a saturated solution of potassium nitrate, and a solution in which ______ continues to dissolve potassium nitrate is called an unsaturated solution of potassium nitrate.

Interactive exploration

Research point 1 Saturated solution and unsaturated solution

[Scenario display]

[Question Research] If potassium nitrate is added to a glass of water, can it be dissolved indefinitely?

[Inductive improvement] Potassium nitrate cannot be dissolved indefinitely in a certain amount of water. We call a solution that can no longer dissolve a certain solute at a certain temperature a saturated solution of that solute, and a solution that can continue to dissolve a certain solute is called an unsaturated solution of that solute. But there is no necessary connection between whether the solution is saturated and the concentration of the solution.

[Core Applications]

Core 1 Saturated solution and unsaturated solution

Example 1: Among the following statements, the correct one is ()

A. A saturated solution of the same solute must contain more solute than its unsaturated solution of the same mass.

B． At a certain temperature, a saturated solution of substance M cannot dissolve any more substances

C． At a certain moment, there are some sodium chloride crystals in a beaker containing a sodium chloride solution, then the solution must be a saturated solution of sodium chloride at that temperature

D． At a certain moment, the solution of a certain substance is either a dilute solution or a saturated solution.

Class feedback

Knowledge point 1: Saturated solution and unsaturated solution

1. The saturated solution of a certain substance must be ()

A. Concentrated solution

B. Dilute solution

C. Solution containing 100 g water

D. A solution that can no longer dissolve the substance

2. A cup of sodium nitrate solution at 20 ℃, which of the following methods can prove that it is a saturated solution ()

A. When 10 g of water evaporates, crystals precipitate

B． Add 10 g sodium nitrate crystals, some crystals are not dissolved

C． When the temperature drops to 10°C, crystals will precipitate.

D． At this temperature, adding a small amount of sodium nitrate crystals will no longer reduce the quality of the crystals

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Update Time: 2024-10-01

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