Unit 12 Solubility Curves Worksheets With Answer Keys Page 3
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6UNIT 12 - SOLUTIONS
6.) What is the molality of a solution in which 3.0 moles of NaCl are dissolved in 1.5 kg of water?
7.) What is the molality of a solution in which 25 grams of NaCl is dissolved in 2.0 kilograms of water?
8.) What is the molality of a solution in which 15 grams of I
is dissolved in 500. grams of alcohol?
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9.) How many grams of I
should be added to 750 grams of CCl
to prepare a 0.020 m solution?
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10.) To how much water should 5.00 grams of KCl be added to prepare a 0.500 m solution?
11.) How much 18 M sulfuric acid (H
SO
) is needed to prepare 250 mL of a 6.0 M solution?
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12.) 17 mL of 12 M hydrochloric acid (HCl) is diluted to 100. mL. What is the concentration of the new
solution?
13.) To what volume should 25 mL of 15 M nitric acid (HNO
) be diluted to prepare a 3.0 M solution?
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14.) To what volume should 50. mL of 12 M hydrochloric acid be diluted to produce a 4.0 M solution?
15.) If 25.0 mL of 18 M sulfuric acid is diluted to 550. mL, what is the concentration of the diluted
solution?
Answers:
Molarity: 1.) 1.0 M
2.) 0.118 M
3.) 101 g
4.) 0.27 L or 270 mL
5.) 1.6 g
Molality: 1.) 2.0 m
2.) 0.22 m
3.) 0.12 m
4.) 3.8 g
5.) 0.135 kg
Dilutions: 1.) 83 mL
2.) 2.0 M
3.) 130 mL
4.) 150 mL
5.) 0.82 M
BOILING POINT & FREEZING POINT PROBLEMS WORKSHEET
o
o
o
o
Solvent
Normal Boiling Point (
C)
K
(
C/m)
Normal Freezing Point (
C)
K
(
C/m)
b
f
water, H
O
100.0
0.52
0.0
1.86
2
benzene, C
H
80.1
2.53
5.5
5.12
6
6
carbon tetrachloride, CCl
76.8
5.02
-22.3
29.8
4
ethanol, C
H
OH
78.4
1.22
-114.6
1.99
2
5
chloroform, HCCl
61.2
3.63
-63.5
4.68
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* Give your answers to the hundredths place (two places to the right of the decimal point). *
1.) Calculate the freezing and boiling points of a solution made from 100. grams of ethylene glycol
(C
H
O
) antifreeze in 900. grams of water.
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2.) Calculate the freezing point of a solution containing 600. grams of chloroform and 42.0 grams of
eucalyptol, C
H
O, a fragrant substance found in the leaves of eucalyptus trees.
10
18
3.) Calculate the boiling point of 25.5 grams of C
H
NO
S (4-nitro-2-toluenesulfonic acid dihydrate) in
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11
7
2
1.00 x 10
grams of water.
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