Chemistry
AS 6.1 Solubility & Solubility Curves
Name: ____________________________
Group #: _______ Block: _______
Use the solubility curve in Fig 18 to solve the following
problems.
1. What is the solubility of potassium nitrate (KNO3) in
100 g of water at 80˚C?
Ans: __________
2. What is the solubility of potassium chloride (KCl) in
100 g of water at 50˚C?
Ans: __________
3. What is the solubility of sodium chloride (NaCl) in
100g of water at 90˚C?
Ans: __________
4. What is the minimum temperature needed to
dissolve 180 g of KNO3 in 100 g of water?
Ans: __________
5. What is the minimum temperature needed to
dissolve 35 g of KCl in 100 g of water?
Ans: __________
6. At what temperature do KCl and KNO3 have the same solubility?
Ans: __________
7. How much more KCl will dissolve at 90˚C than at 20˚C?
Show work!
Ans: __________
8. If 50g of NaCl is mixed with 100g of water at 80˚C, how much will not dissolve?
Show work!
Ans: __________
9. If 5 g of NaCl is added to 100 g of water at 30˚C,
how much more must be added to saturate the
solution? Show work!
Ans: __________
10. How much NaCl will dissolve in 350 g of water
at 70˚C? Show work!
Ans: __________
11. How much KCl will dissolve in 45g of water at
50˚C?
Show work!
Ans: __________
12. Classify as saturated, unsaturated, or
supersaturated a solution that contains 90 g of
KNO3 in 100 g of water at 60˚C.
Ans: ___________________
13. If 50 g of KCl is dissolved in 100 g of 70 ˚C
water, the solution is supersaturated, saturated,
or unsaturated?
Ans: ___________________
14. If a saturated solution of KNO3 at 20.0 °C is heated to 80.0 °C, how much more could be
dissolved?
Ans: ___________________
15. If a saturated solution of KCl at 90.0 °C is cooled to 30.0 °C, how much of the solid will precipitate?
Ans: ___________________
16. A supersaturated solution of KNO3 is formed by adding 150g KNO3 to 100g water, heating until the
solute completely dissolves, and then cooling the solution to 55°C. If the solution is agitated, how
much potassium nitrate will precipitate?
Ans: ___________________
17. How could you make a supersaturated solution that contains 80 g of KNO3 in 30°C water? BE
SPECIFIC!