1. Solubility Curves
The amount of a solute that will dissolve in a solvent depends upon the temperature of the solution.

2. KNO3 dissolved in water
The data to the right is how many grams of KNO3 solid that will dissolve in 100ml of water at different temperatures.
Temperature Mass
0oC 15g
10oC 23g
20oC 34g
30oC 47g
38oC 60g

3. KNO3 dissolved in water
This graphs shows the relationship between how much solid potassium nitrate will dissolve in water at different temperatures. Notice how it is not a straight line, but curves upward. The hotter the water, the more potassium nitrate will dissolve.

4. Question? How much Potassium Nitrate will dissolve at
25 degrees Celsius?
Follow the line up
from 25 degrees and
then over to the
mass.

5. Solubility Curve of NH3
Notice how the curve is different from the solid potassium nitrate. The reason is simple, ammonia (NH3) is a gas. Therefore it is less soluble in hot water.

6. Saturated Solution Any point on the line indicates a saturated
solution. Saturated
means the solvent
has dissolved as
much solute as
possible.

7. Unsaturated Solution The red area of the graph represents an
solution. Less
solute is dissolved
than a saturated
solution.

8. Supersaturated Solution
The red area of
the graph
represents a
supersaturated
solution. More
solute is dissolved
than a saturated
solution.

9. Use this graph to help you answer the rest of the questions.