W29 Notes (Part 2):

Factors that Affect Solubility

What factors affect the solubility of a solute?

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1. The rate at which a solid solute dissolves will increase when there is an :

↑ temperature

↑ surface area

↑ stirring

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2. The amount of a solid solute that can dissolve in a solvent is affected by: � -Temperature (if temperature↑, then amount able to dissolve ↑)� -The amount of other ions in solution (particularly H+)�

Example: making rock candy- more sugar dissolves in warm water, comes out of solution as it cools. �

3. For gas solutes, the amount of solute that can dissolve changes with :

↓ temperature

↑pressure

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Example: carbon dioxide bubbles dissolved in soda

4. Solubilities of 4 substances at different temperatures

One substance is a gas. Which one? NH₃

How do you know by the graph? Solubility decreases when temperature increases

How many grams of NH₄Cl can be dissolved at 65^oC? 60 grams

5. Solubility of KNO₃ at different temperatures.

Define each of these three related words.

Is the solution saturated when 200 grams is dissolved in 100 grams water at 100^oC? No

6. Try these Practice problems: My score: ______

Homework: (Turn in tomorrow)

Solubility info

Read then answer the questions at the end.

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