SOLUTIONS
1. Calculate the mass in grams of KMnO4 that should be used to prepare 2.0 L of
0.25 M KMnO4 solution.
2. What is the molarity of a 500 mL solution that contains 5.0 grams of NaOH?
3. Calculate the boiling point and freezing point of a 20% aqueous sucrose
C12H22O11 (MM= 342 g) solution
4. A sulfuric acid solution has a density of 1.73 g/mL and contains 80% H2SO4 by
weight. What is the molarity of this solution?
5. What will be the percent composition by weight of a solution made by dissolving
12.0 g of Zinc nitrate, Zn(NO3)2 in 45.0 g of water?
6. What volume of 0.5 M HCl must be diluted with water to give 2.0 liters of 0.2 M
HCl?
7. If100 g of glycerine, C3H8O3 ( MM = 92 g) is mixed with 150 mL of water, what is
the vapor pressure of solution at 25oC (Po H2O at 25oC = 23.75 mmHg) ?
8. A 50% by mass solution in water is prepared. If 10 grams of the salt is used in
the preparation, how many cm3 of water was required?
9. How would you prepare 60.0 mL of 0.2 M HNO3 from a stock solution of 4 M
HNO3?
10.Calculate the normality of a H2SO4 solution containing 1.5 g of H2SO4 in 120 mL
of solution in reactions that replace all two H+
11.Calculate the number of grams of HNO3 necessary to prepare 185 mL of 0.15 N
HNO3 solution in reactions that replace H+
12.What is the normality of 0.125 M Ca(OH)2?
13.Calculate the molality of a solution prepared by dissolving 10.0 g of NaCl in 600 g
of water.
14.Methanol, CH3OH is used as antifreeze. How many grams of methanol do we
need per 1000 g of water for an aqueous solution to stay liquid at -20oC?
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