Solubility Curve Practice Problems Worksheet
Name________________________
Directions: Use the graph below to answer the following questions. If the question requires a calculation, SHOW
ALL WORK TO RECEIVE CREDIT FOR THE ANSWER. No work, no credit, no kidding! Remember units.
Types of Solutions
 Points that collectively make up the
solubility curve (points ON the curve)
represent ___________________
solutions.
 Points that are BELOW the curve
represent ___________________
solutions.
 Points ABOVE the solubility curve
represent ___________________
solutions, and the difference between
the point above the curve and on the
curve represents the amount of solute
which will precipitate out.
1. a. What is the solubility of calcium chloride at 5C?
b. What is the solubility of calcium chloride at 25C?
___g/100g of H2O
___g/100g of H2O
c. What is happening to the solubility and temperature?
Solubility is ___Increasing or Decreasing___ as temperature is __Increasing or Decreasing___.
What is this type of relationship called? __direct or indirect___.
This occurs for which type of solutes? ___gasses or solids____
2. a. What is the solubility of cerium sulfate at 10C?
___g/100g of H2O
b. What is the solubility of cerium sulfate at 50C?
___g/100g of H2O
c. What is happening to the solubility and temperature?
Solubility is ___increasing or decreasing____ as temperature is ___increasing or decreasing_____.
What is this type of relationship called? __direct or indirect__
3. a. At 90C, 10 g of potassium chlorate is dissolved in 100. g of water.
Is this solution saturated, unsaturated, or supersaturated?
b. How do you know?
Solubility Curve Practice Problems Worksheet
Name________________________
4. A saturated solution of potassium chlorate is dissolved in 100. g of water. If the saturated solution is cooled
from 90C to 60C, how many grams of precipitate will be formed?
__________
5. Which substance on the graph is least soluble at 10C?
__________
6. Which substance on the graph shows the least change in solubility from 0C to 100C?
__________
Complete the following equations when the following ionic solids get placed in water naming the ions and the
compounds:
Example:
Ca(OH)2
--->
Answers:
Ca(OH)2
--->
Calcium Hydroxide
7. K2CO3 --->
8. Na2CO3 --->
9. NaC2H3O2 --->
10. Al2(SO4)3 --->
11. FeBr2 --->
12. CuCl2 --->
13. Pb(NO3)2 --->
14. CuS --->
15. MgSO4 --->
16. Pb(NO3)2 --->
17. FeCl2 --->
18. FeBr3 --->
Ca+2
+
2OH-
Calcium Ion
+
Hydroxide