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Authoritative PPT Summary
"Amount of Dissolved Substance" Solution PPT Courseware 2
learning target
1. Understand the concept of solubility.
2. Know how to express gas solubility and its influencing factors.
1. Solubility of solid substances
1. Definition: At a certain temperature, the mass of a solid substance dissolved when it reaches saturation in 100g of a solvent is called the solubility of this substance in this solvent.
Four elements of solid solubility: Factors affecting solubility:
Conditions: a certain temperature Internal factors: the properties of the solute and solvent themselves
Standard: 100g External factor: temperature
Solution state: saturated state
2. The relationship between solubility and solubility
practise:
1. Insoluble matter is a substance that is absolutely insoluble in water. is it right or not?
2. The solubility of CaCO3 is 0.0013g at 20℃, so CaCO3 is a ____ soluble substance.
3. The solubility of NaCl is 36g at 20℃. So NaCl is ____ soluble substance
3. Solid solubility curve
The information provided by the solubility curve:
1. The curve represents the solubility of a substance at different temperatures or the change of solubility with temperature.
2. Each point on the curve represents the solubility of the solute at that temperature, and the solution is a saturated solution.
3. The intersection of the curves indicates that the solubilities of the two substances at that temperature are equal.
4. The point below the solubility curve indicates that the solution is unsaturated.
4. Gas solubility
When the pressure is 101kPa and a certain temperature, the volume of gas dissolved in 1 volume of water reaches saturation.
Five elements of gas solubility:
1. Pressure 101kPa
2. Certain temperature
3. 1 volume of water
4. Reach saturation state
5. Gas volume
Small scale chopper
1. At 20℃, the solubility of sodium chloride is 36g, which means ( )
A. At 20°C, 100g of sodium chloride saturated solution contains 36g of sodium chloride.
B. At 20°C, 36g of sodium chloride is dissolved in 100g of water, and the solution reaches a saturated state.
C. A maximum of 36g sodium chloride can be dissolved in water at 100℃
D. At 20°C, 36g of sodium chloride is dissolved in water, and the solution reaches saturation.
2. A large number of bubbles will be produced when opening the cap of a soda bottle; people often burp after drinking soda. The reason for the above different phenomena is that the solubility of gas in water varies with ( )
A. Pressure increases as it decreases, and decreases as temperature increases.
B. The pressure decreases and decreases, and the temperature decreases and decreases.
C. Pressure decreases and increases, and temperature increases and increases
D. The pressure decreases and decreases, and the temperature increases and increases.
3. The solubility curves of three substances A, B, and C are as shown in the figure:
(1) At t1°C, the order of solubility of the three substances A, B, and C from large to small is _______________
(2) At t3℃, add 60g of substance A to 100g of water, and after sufficient stirring, the mass of the resulting solution is _____
(3) At t3℃, equal masses of A, B and C
In a saturated solution of three substances, when the temperature drops to t2°C, the substance that precipitates the most solids is _____, and the substance that does not precipitate is _____
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"Amount of Dissolved Substance" Solution PPT Courseware 5:
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"Amount of Dissolved Substance" Solution PPT Courseware 4:
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