1. READ SOLUBILITY CURVES
HOW TO
READ SOLUBILITY CURVES

2. What is Solubility?
Solubility: the maximum amount of solute that will dissolve in a certain amount of solvent at a given temperature
Solute = substance dissolved
Solvent = does the dissolving
Example: ___grams of salt (NaCl) dissolved in 100g of water at ___℃

3. Temperature and Solubility
Temperature affects how much of the solute can be dissolved by the solvent.
Solubility Curves: Are used to show how the solubility of a substance changes with temperature

4. Solubility Curve

5. Solubility Curve - Saturated
Any point on a line represents a saturated solution
In a saturated solution, the solvent contains the maximum amount of solute
Example: At 90℃, 40g of NaCl in 100g H2O represent a saturated solution.

6. Solubility Curve - Unsaturated
Any point below a line represents an unsaturated solution.
In an unsaturated solution, the solvent contains less than the maximum amount of solute.
Example: At 90℃, 30g of NaCl in 100g of H2O represents an unsaturated solution.

7. Solubility Curve - Supersaturated
Any point above a line represents a supersaturated solution.
In a supersaturated solution, the solvent contains more than the maximum amount of solute.
Example: At 90℃, 50g of NaCl in 100g H2O represents a supersaturated solution.

8. To read the graph: Find the line for the substance
The amount that dissolves at a given temperature is on the y-axis

9. How much KNO3 dissolves in 100g H2O at 50℃
Find the line for KNO3 (red)
Find the temperature and follow up to the line for KNO3 (green)
Read across to the y-axis and this is the answer (blue)
About 87g of KNO3 will dissolve