7.
What two salts have the same solubility at approximately 26 oC?

8.
NaNO3 and CaCl2
Are the following solutions saturated, unsaturated or supersaturated?
a. 50. g of CaCl2 in 100 mL of water at 30oC

Unsaturated
b. 50. g of Pb(NO3)2 in 100 mL of water at 60oC

Unsaturated
c. 80. g of NaNO3 in 100 mL of water at 10oC

9.
What is the lowest temperature at which 30. g of KCl can be dissolved in 100. mL of
water?

10.
Saturated
10 °C
At 50 oC, what mass of potassium dichromate can be dissolved in 200. mL of water?
30 g
x
=
; x = 60 g
100 g 200. g
11.
If 50. mL of water that is saturated with K2Cr2O7 at 50 oC is slowly evaporated to
dryness, how many grams of the dry salt would be recovered?
30 g
x
=
; x = 15 g
100 g 50. g
12.
Thirty grams of KCl are dissolved in 100 mL of water at 45oC. How many additional
grams of KCl are needed to make the solution saturated at 80oC?
51 g – 30 g = 21 g
13.
A saturated solution of KClO3 is prepared at 70 oC using 100. mL of water. How many
grams of solute will precipitate out of solution if the temperature is suddenly cooled to
30oC?
30 g – 10 g = 20 g precipitate
14.
What is the smallest volume of water required to completely dissolve 40. g of KNO3 at
10 oC?
20 g
40. g
=
; x = 200 mL
100 g
x