CK-12-Chemistry Intermediate

16.1. Solubility http://www.ck12.org

c. high temperature and low pressure

d. high temperature and high pressure

Problems

7. List the original states (solid, liquid, or gas) of the solute and solvent that are combined to make each of the
   following solutions.
   a. an alloy
   b. salt water
   c. carbonated water
   d. oil in gasoline

Use the solubility curve from the text (Figure16.4) to answer questions 8-10.

8. Answer the following:
   a. How many grams of NH 4 Cl are required to make a saturated solution in 100 g of water at 70°C?
   b. How many grams of NH 4 Cl could be dissolved in 200 g of water at 70°C?
   c. At what temperature is a solution of 50 grams of KNO 3 dissolved in 100 grams of water a saturated
   solution?
   d. Which two substances in the above graph have the same solubility at 85°C?
   e. How many grams of NaNO 3 can be dissolved in 100 grams of water to make a saturated solution at
   25°C?
   f. How much KI can be dissolved in 5 grams of water at 20°C to make a saturated solution?


9. An exactly saturated solution of KClO 3 is prepared at 90°C using 100 grams of water. If the solution is cooled
   to 20°C, how many grams of KClO 3 will recrystallize?


10. Indicate whether the following solutions are unsaturated, saturated, or supersaturated. Assume that all three
    could potentially form a supersaturated solution.
    a. 22 grams of KClO 3 is dissolved in 100 g of water at 50°C.
    b. 60 grams of KNO 3 is dissolved in 100 g of water at 50°C.
    c. 50 grams of NaCl is dissolved in 100 g of water at 50°C.


11. The solubility of a gas in water is 3.28 g/L at 304 kPa. What is its solubility at standard pressure?

Further Reading / Supplemental Links

• SolubilityofThings, http://www.solubilityofthings.com/


• SolubilityCurves, http://www.kentchemistry.com/links/Kinetics/SolubilityCurves.htm


• Henry’sLaw, http://www.kentchemistry.com/links/Kinetics/HenrysLaw.htm

Points to Consider

Solutions are prepared by dissolving a certain amount of solute in a certain amount of solvent. The concentration of
a solution is a quantitative measure of how much solute has been dissolved.

• What are the ways in which the concentration of a solution can be calculated?


• What happens to the concentration of a solution when additional solvent is added?