1. How much is the solubility of potassium
nitrate in 17 grams of water at 50 oC?
@ 50oC 85g KNO3/ 100g H2O x
100 = 17
x = 14.5 g KNO3

2. Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC:
7 g KNO3 = 70 g KNO3
10 g of H2O g H2O
supersaturated
How many grams
will precipitate ? X
70 – 64 = 6 g
6 g
100 g
= x
10 g
= 0.6 g KNO3

3. What type of solution is 30 g of potassium
chloride in 60 g of water at 85 oC?
30 x
60 = 100
x = 50 g @ 85oC
unsaturated

4. Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC:
7 g KNO3 = 70 g KNO3
10 g of H2O g H2O
supersaturated
How many grams
will precipitate ? X
70 – 64 = 6 g
6 g
100 g
= x
10 g
= 0.6 g KNO3

5. What is the mass % of potassium chlorate
at 10oC?
10oC 5 g
100 g
KClO3
H2O 5
105 = 4.8 %
part = solute
whole solution
(solute +solvent)

6. Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC:
7 g KNO3 = 70 g KNO3
10 g of H2O g H2O
supersaturated
How many grams
will precipitate ? X
70 – 64 = 6 g
6 g
100 g
= x
10 g
= 0.6 g KNO3

7. 75 g NaNO3 Sat @ 35o 100 g NaNO3 = 75 g H2O 100 g H2O
A solution is made of 90 grams of sodium
nitrate in 75g of water at 55oC. How many
grams will precipitate if the solution is
cooled to 35 oC?
35o g NaNO3
100 g H2O
75 g NaNO3
= 75 g H2O
  = 15 g ppt

8. @ 50oC Saturated = 50g 100g 50 x 100 = 35 x = 17.5 g 17.5 – 11 = 6.5g
A solution has 11 grams of NH4Cl dissolved
in 35g H2O at 50 oC. How many more grams
are needed to make a saturated solution?
@ 50oC Saturated = 50g
100g x
= 35 x = 17.5 g
17.5 – 11 = 6.5g

9. Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC:
7 g KNO3 = 70 g KNO3
10 g of H2O g H2O
supersaturated
How many grams
will precipitate ? X
70 – 64 = 6 g
6 g
100 g
= x
10 g
= 0.6 g KNO3