Quantitative Solutions Workbook
Review of Molar Mass and Mole Calculations
Complete the following chart, showing all calculations, formulas, substitutions, units and significant
digits.
Name and
Formula
Molar Mass
Mass
Moles
1.
NaCl(s)
0.20 mol
2.
sodium
hydroxide
5.48 g
3.
(NH4)3PO4(s)
0.600 mol
4.
sodium
carbonate
octahydrate
50 g
Name and
Formula
Molar Mass
Mass
Moles
5.
Ca(NO3)2(s)
8.45 g
6.
potassium
dichromate
5.65 g
7.
Na2CO3(s)
0.850 mol
8.
sulphur
trioxide
1.45 mol
Percent By volume Calculations
1. If I make a solution by adding water to 35 mL of methanol (CH3OH) until the final
volume of the solution is 275 mL…
2. Calculate the volume percent, %(v/v), of solute in the following solution: 20.0 mL of
methyl alcohol in enough water to give 475 mL of solution.
3. If I make a solution by adding water to 75 mL of ethanol until the total volume of the
solution is 375 mL, what’s the percent by volume of ethanol in the solution?
4. If I add 35 mL of solute to 450 mL of solvent what would be my percent by volume
concentration?
5. Determine the volume percent of toluene in a solution made by mixing 40.0 mL toluene
with 75.0 mL of benzene.
6. Determine the volume percent of cream in a solution made by mixing 15.5 mL cream
with 350.0 mL of coffee.
7. If I need 1.5 L a 36% (V/V) solution. What volume of solute and solvent will I need?
8. If I need 350 ml of a 25% (V/V) solution. What volume of solute and solvent will I need?
9. If I make 2.5L of solution using 45ml of solute what percent by volume would be the
concentration of my solution?
10. If you wanted to create a 25% (V/V) solution and only had 250 mL of solute what would
be the maximum amount of solution you could make?
Parts Per Million Concentration
1. If I add 1.65 L of water to 112 grams of sodium acetate… what would be the concentration in
ppm?
2. 25 grams of a chemical is dissolved in 75 grams of water. What is the concentration in
ppm?
3. Suppose 17 grams of sucrose is dissolved in 183 grams of water. What is the
concentration of sucrose in pph ? ppm?
4. The solubility of NaCl is 284 grams/100 grams of water. What is this concentration in
ppm?
5. The solubility of AgCl is 0.008 grams/100 grams of water. What is this concentration in
ppm?
6. Helium gas, 3.0 x 10 -4 g, is dissolved in 200 g of water. Express this concentration in
parts per million.
7. A sample of 300.0 g of drinking water is found to contain 38 mg Pb. What is this
concentration in parts per million?
8. If a 25 g sample contains 1.5 ppm of fluoride what mass of fluoride is in the sample?
9. If a 0.600 kg sample contains the maximum acceptable concentration of lead at 0.010
ppm, what how many grams of lead would be in the sample?
10. If a sample of fish contains 0.025 ppm of arsenic and there is 1.5 g of arsenic in the
sample, what is the mass of the fish sample tested?
Molar Concentrations
1. What is the molar concentration of a solution in which 0.240 mol of washing soda,
Na2CO3 10 H2O, is dissolved in water to make 0.500 L of a solution for softening water.
2. What is the molar concentration of 500 mL of a solution that contains 12.7 g of
swimming pool chlorinator, calcium hypochlorite?
3. How many moles of solid sodium hydrogen carbonate would be needed to make 0.100 L
of a 0.600 mol/L solution suitable for use as an antacid?
4. What mass of sodium hydroxide (lye) must be added to 1.50 L of water in order to
prepare a solution with a concentration of 0.0750 mol/L?
5. Calculate the volume of 0.100 mol/L solution that can be prepared from 3.60 mmol of
caustic soda.
6. What volume of 0.700 mol/L brush cleaning solution can be prepared from 126 g of
sodium phosphate, Na3PO4(s)?
7. Calculate the molar concentration of an ink solution that contains 0.210 mol of iron(II)
sulphate dissolved in 480 mL of water.
8. The protective coating on a car battery terminal can be prepared by dissolving 0.240 kg
of sodium silicate in water to make 250 mL of solution. What is the molar concentration
of this solution?
9. Sodium phosphate can be used to remove scale deposits from a car radiator. What
volume of a 0.075 mol/L solution would contain 1.10 mol of sodium phosphate?
10. A 0.100 mol/L solution of zinc nitrate is needed for a chemistry lab. What is the mass of
zinc nitrate necessary to produce 250 mL of this solution?
Standard Solution
1.
in photography because it readily dissolves silver compounds. Describe how to prepare
100 mL of a 0.120 mol/L hypo solution.
2. Sodium bicarbonate (sodium hydrogen carbonate) is used in baking as baking soda, or as
one of the components of baking powder. Describe how to prepare 250 mL of a 0.821
mol/L solution of sodium bicarbonate.
3. Ammonium carbonate is a suitable replacement for the aqueous solution of ammonia as a
household cleaning agent. Describe how to prepare 1.00 L of a 0.450 mol/L solution of
ammonium carbonate.
4. Pots, kettles and frying pans and other non-aluminum household utensils can be
economically cleaned of grease by using a solution of lye (sodium hydroxide). Describe
how to prepare 2.50 L of a 0.100 mol/L solution of lye.
Dilution
Dilution of Solutions
1.
Determine the volume of concentrated hydrochloric acid (11.6 mol/L) required to prepare
10.0 L of a 0.200 mol/L solution.
2.
What volume of 14.8 mol/L ammonia is required to prepare 2.0 L of a 1.0 mol/L
solution?
3.
What is the molar concentration of a sodium hydroxide solution prepared when 10 L of
19.1 mol/L solution is diluted to 400 L?
4.
To what volume must 10.0 mL of 17.2 mol/L ethanol be diluted in order to prepare a
10.3 mol/L ethanol solution?
5.
What is the molar concentration of household ammonia solution if 7.5 mL are diluted to
0.250 L to make a 0.021 mol/L solution?
6.
To what volume must 60 L of a 2.50 mol/L toxic solution be diluted to in order to make