Solubility Curves Each substance has its own unique solubility which can be displayed on a graph

Temperature and Solubility SOLID- As temperature increases solubility of a solid solute will increase GAS- as temperature increases solubility of a gas will decrease  graph goes down

How to solve solubility curve problems Least soluble = lowest line at temp Most soluble = highest line at temp If given different amount of water Grams of precipitate formed

Supersaturated Saturated Unsaturated Point is above the line Point is on the line Unsaturated Point is below the line

Solubility Curve I

1.Which salt is least soluble in water at 20C°?

2.How many grams of potassium chloride can be dissolved in 200 g of water at 80°C?

3. At 40°C, how much potassium nitrate can be dissolved in 300 g water?

4. Which salt shows the least change in solubility from 0°C to 100°C?

5. At 30°C, 90 g of sodium nitrate is dissolved in 100 g of water 5. At 30°C, 90 g of sodium nitrate is dissolved in 100 g of water. Is the solute saturated, unsaturated, or supersaturated?

6. A saturated solution of potassium chlorate is formed from 100 g of water. If the solution is cooled from 80°C to 50°C, how many grams of precipitate are formed?

7. What compound shows a decrease in solubility from 0°C to 100°C?

8. Which salt is most soluble at 10°C?

9. Which salt is least soluble at 50°C?

10. Which salt is least soluble at 90°C?

Pressure and solubility Henry’s Law – solubility of any gas increases as pressure is increased This is why cokes go flat. When you open the can the external pressure has been reduced and this decreases the solubility of the carbonation (CO2) Solubility = g / L Pressure = atmosphere

If 0. 55 g of a gas dissolves in 1 If 0.55 g of a gas dissolves in 1.0 L of water at 2 atm of pressure, how much will dissolve at 4.5 atm of pressure?

A gas has solubility of 0. 66 g/L at 10 atm of pressure A gas has solubility of 0.66 g/L at 10 atm of pressure. What is the pressure on a 1 L sample that contains 1.5 g of gas?

3. If 0. 68 g of a gas at 5 atm of pressure dissolves in 1 3. If 0.68 g of a gas at 5 atm of pressure dissolves in 1.0 L of water at 25°C, how much will dissolve in 1.0 L at 8 atm of pressure and the same temperature?

4. A gas has a solubility of 1. 46 g/L at 8 atm of pressure 4. A gas has a solubility of 1.46 g/L at 8 atm of pressure. What is the pressure of a 1.0 L sample that contains 2.7 g/L?

5. If 1. 2 g of a gas at 6 atm of pressure dissolves in 1 5. If 1.2 g of a gas at 6 atm of pressure dissolves in 1.0L of water at 25°C, how much will dissolve in 1.0L of water at 3 atm of pressure and the same temperature?