Molarity and Dilution Practice Worksheet
A Grade 12 Chemistry worksheet covering molarity calculations and dilution principles with various problem types.
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Molarity and Dilution Practice
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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.
1. Molarity is defined as the number of of solute per liter of .
2. When diluting a solution, the number of moles of solute , while the volume of the solution .
3. The formula used for dilution calculations is .
1. What is the molarity of a solution made by dissolving 2.5 moles of NaCl in 500 mL of water?
0.5 M
2.5 M
5.0 M
1.25 M
2. If you dilute 100 mL of a 2.0 M solution to a final volume of 500 mL, what is the new molarity?
0.4 M
1.0 M
0.2 M
0.8 M
1. Calculate the molarity of a solution prepared by dissolving 25.0 g of potassium hydroxide (KOH) in enough water to make 750 mL of solution. (Molar mass of KOH = 56.11 g/mol)
2. Describe the steps you would take in a laboratory to prepare 250 mL of a 0.50 M solution of sodium chloride (NaCl) from a solid sample of NaCl. (Molar mass of NaCl = 58.44 g/mol)
1. To dilute a solution, you should always add water to the concentrated acid.
True
False
2. Molarity is a temperature-dependent concentration unit.
True
False
You have a 6.0 M stock solution of HCl. You need to prepare 300 mL of a 0.75 M HCl solution. What volume of the stock solution is needed, and what volume of water should be added?