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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