Homework 6/26/13

Pg. 56

1)
a. 105 KNO3
b. 44 KCl

2)
a. 20 grams of potassium nitrate must be added to form a saturated solution at 20 degrees Celsius
b. 45 grams is the minimum mass needed to dissolve 25 g potassium nitrate

3)
a. 60 grams of potassium nitrate will precipitate.
b. 110 will have to be added to dissolve all of the KNO3.


pg. 82

1) As the temperature of water increases, the solute dissolves easier. Since tea has a higher temperature than iced tea, the three teaspoons of sugar will completely dissolve.

2) The maximum mass that will dissolve is 48 grams.

3)
a. 200 grams
b. 710 grams
c. 1,892 grams

4)
a. NaCl, KCl, KNO3.
b. KNO3, KCl, NaCl.

5) A saturated solution is a solution in which the solvent contains as much dissolved solute that it can hold at a specific temperature. A unsaturated solution is a solution that contains less dissolved solute than the amount the solute can hold at a specific temperature. 

6)
a. 30 grams
b. Saturated 
c. 90 grams should form.

7)
a. If the solution is unsaturated, it will dissolve. 
b. If the solution is saturated, it will become rebalanced.
c. If the solution is supersaturated the crystal will sink to the bottom.

8) If you have 115 grams of water
35/115+35 = 23% et by mass.