Chapter 15: Solutions - Weironline.net
Chapter 15: Solutions - Weironline.net
Chapter 15: Solutions - Weironline.net
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Molarity (<strong>15</strong>.2)<br />
76. What is the molarity of the following solutions?<br />
a. 2.5 mol KCl in 1.0 L of solution<br />
b. 1.35 mol H 2 SO 4 in 245 mL of solution<br />
c. 0.875 mol of ammonia in <strong>15</strong>5 mL of solution<br />
77. What is the molarity of the following solutions?<br />
a. 0.96 g MgCl 2 in 500 mL of solution<br />
b. 9.33 g Na 2 S in 450 mL solution<br />
c. 2.48 g CaF 2 in 375 mL of solution<br />
78. How many moles of solute are contained in the following<br />
solutions?<br />
a. <strong>15</strong>.25 mL 2.10M CaCl 2<br />
b. 125 mL 0.0500M Ba(OH) 2<br />
c. 53.1 mL 12.2M HCl<br />
79. How many grams of solute are contained in the following<br />
solutions?<br />
a. 64.3 mL 0.0238M KOH<br />
b. 142 mL 1.40M K2SO4 c. 750.0 mL 0.225M NH4OH Molar Dilution (<strong>15</strong>.2)<br />
80. How many milliliters of 2.55M NaOH is needed to<br />
make 125 mL 0.75M NaOH solution?<br />
81. How many milliliters of 0.400M HBr solution can be<br />
made from 50.0 mL of 8.00M HBr solution?<br />
82. What is the molarity of each resulting solution when<br />
the following mixtures are prepared?<br />
a. 500.0 mL H 2 O is added to 20.0 mL 6.00M HNO 3<br />
b. 30.0 mL 1.75M HCl is added to 80.0 mL 0.450M<br />
HCl<br />
Molality and Mole Fraction (<strong>15</strong>.2)<br />
83. Calculate the molality of the following solutions.<br />
a. <strong>15</strong>.7 g NaCl in 100.0 g H2O b. 20.0 g CaCl2 in 700.0 g H2O c. 3.76 g NaOH in 0.850 L H2O 84. Calculate the mole fraction of NaCl, CaCl2 , and<br />
NaOH in the solutions listed in the previous problem.<br />
85. What are the molality and mole fraction of solute in a<br />
35.5 percent by mass aqueous solution of formic acid<br />
(HCOOH)?<br />
Colligative Properties (<strong>15</strong>.3)<br />
86. Using the information in Tables <strong>15</strong>-4 and <strong>15</strong>-5, calculate<br />
the freezing point and boiling point of 12.0 g of<br />
glucose (C 6 H 12 O 6 ) in 50.0 g H 2 O.<br />
CHAPTER <strong>15</strong> ASSESSMENT<br />
87. Using the information in Tables <strong>15</strong>-4 and <strong>15</strong>-5, calculate<br />
the freezing point and boiling point of each of the<br />
following solutions.<br />
a. 2.75m NaOH in water<br />
b. 0.586m of water in ethanol<br />
c. 1.26m of naphthalene (C10H8 ) in benzene<br />
88. Arock salt (NaCl), ice, and water mixture is used to<br />
cool milk and cream to make homemade ice cream.<br />
How many grams of rock salt must be added to water<br />
to lower the freezing point 10.0°C?<br />
89. Calculate the freezing point and boiling point of a<br />
solution that contains 55.4 g NaCl and 42.3 g KBr dissolved<br />
in 750.3 mL H2O. Mixed Review<br />
Sharpen your problem-solving skills by answering the<br />
following.<br />
90. If you prepared a saturated aqueous solution of potassium<br />
chloride at 25°C and then heated it to 50°C,<br />
would you describe the solution as unsaturated, saturated,<br />
or supersaturated? Explain.<br />
91. Use the graph below to explain why a carbonated beverage<br />
does not go flat as quickly when it contains ice.<br />
Solubility (mol/L)<br />
8<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
Solubility of CO 2<br />
in Water at 1 atm<br />
0<br />
0 10 20 30 40 50 60 70<br />
Temperature (�C)<br />
92. Which of the following substances will be soluble in<br />
the nonpolar solvent carbon tetrachloride (CCl4 ): Br2 ,<br />
C6H14, NaNO3, HCl? Explain.<br />
93. How many grams of calcium nitrate (Ca(NO3 ) 2 ) would<br />
you need to prepare 3.00 L of a 0.500M solution?<br />
94. What would be the molality of the solution described<br />
in the previous problem?<br />
Assessment 485
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