Section 15.2
Solution Concentration
Practice Test
1.
What is the percent by mass of NaCl in a solution that contains 17.5 g NaCl per 500.0 g of water?
a.
3.38%
b.
3.50%
c.
3.61%
d.
14.80%
Hint
2.
How much solvent is needed to make 200 ml of 50% rubbing alcohol?
a.
50 mL
b.
100 mL
c.
150 mL
d.
200 mL
Hint
3.
Calculate the molarity of 0.75 L of a solution containing 0.83 g of dissolved KCl.
a.
0.015 M
b.
0.75 M
c.
1.1 M
d.
6.2
Hint
4.
How many grams of NaCl are dissolved in 500.0 mL of a 0.05M solution of NaCl?
a.
0.05 g
b.
0.29 g
c.
1.46 g
d.
2.92 g
Hint
5.
A solution that contains less solute per volume of solvent than another solution made from the same components is said to be more ________.
a.
dilute
b.
concentrated
c.
solvated
d.
dissolved
Hint
6.
Molarity is defined as the ____________.
a.
mass of solute per mass of solution
b.
volume of solute per volume of solution
c.
moles of solute per liter of solution
d.
moles of solute per kilograms of solvent
Hint
7.
What volume of 12.6
M
HCl must be added to sufficient water to prepare 5.00 liters of 3.00
M
HCl?
a.
1.19 L
b.
21.0 L
c.
0.840 L
d.
7.56 L
Hint
8.
What mass of Ca(OH)
2
is contained in 1500 mL of 0.0250
M
Ca(OH)
2
solution?
a.
3.17 g
b.
2.78 g
c.
1.85 g
d.
2.34 g
Hint
9.
Calculate the molality of a solution that contains 25 g of H
2
SO
4
dissolved in 80 g of water.
a.
1.6
m
b.
2.2
m
c.
3.2
m
d.
6.3
m
Hint
10.
Calculate the molality of 10% H
3
PO
4
solution in water.
a.
0.380
m
b.
0.760
m
c.
1.13
m
d.
1.51
m
Hint
11.
What is the mole fraction of ethanol (C
2
H
5
OH) in a solution of 47.5 g of ethanol in 850 g of water?
a.
0.021
b.
0.18
c.
0.032
d.
0.98
Hint
12.
What is the molarity of 2500 mL of a solution that contains 160 grams of ammonium nitrate (NH
4
NO
3
)?
a.
0.333
M
b.
0.450
M
c.
0.600
M
d.
0.800
M
Hint
