REVIEW PROBLEMS – CONCENTRATION



CHEM 220 - Concentration

Problem Set #2

1. The following are all units of concentration. Define each of them fully.

a. Molarity

b. wt%

c. pph

d. ppm

e. ppb

f. Molality

g. Normality

2. Concentrated acids and bases have a specific molarity associated with them which is often expressed in terms of wt%. Fill in the table below for the Molarity or wt% of the particular acid or base.

|Acid and/or Base |wt% |Molarity (m/L) |Density (g/mL) |

|Hydrofluoric |49.0 | |1.30 |

|Acetic | |17.4 |1.05 |

|Potassium Hydroxide |45.0 | |1.44 |

3. Calculate the number of grams of Ca needed to make 100 mL of a 2000 ppb Ca solution.

4. How many mL of a 70.4 wt% HNO3 solution with a density of 1.41 g/mL do you need to make

900. mL of a 3.00 M HNO3 solution?

5. The specific gravity of ammonium hydroxide, which contains 28.0 wt% NH3, is 0.899. What volume of this reagent should be diluted to make 500. mL of 0.250 M NH3?

6. What is the molality of a solution that is 96 wt% H2SO4 (density is equal to 1.84 g/mL)?

7. Calculate the weight percent of a HCl solution that has a molality of 4.5 and a total solvent (H2O) volume of 86mL.

8. Calculate the Normality of the following acids

a. 10.0 moles of sulfuric acid in 200.mL of water

b. A solution of nitric acid that has a molarity of 5.0M

9. If a solution of phosphoric acid has a Normality of 1.0N, what is its concentration expressed in Molarity?

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