Molarity Practice Worksheet
This worksheet provides practice problems on calculating molarity, preparing solutions, and understanding dilution, suitable for Grade 12 Chemistry students.
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Molarity Practice Worksheet
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Read each question carefully and show all your work. Use appropriate units and significant figures in your final answers. Round atomic masses to two decimal places (e.g., Na = 22.99 g/mol).
1. Molarity is defined as the number of moles of solute per of solution.
2. To prepare a solution of a specific molarity, one must know the mass of the solute and the final of the solution.
3. The formula for dilution is M1V1 = .
1. What is the molarity of a solution containing 0.50 moles of NaCl in 500 mL of solution?
0.25 M
0.50 M
1.0 M
2.0 M
2. Which of the following pieces of lab equipment is most accurate for measuring the volume of a solution when preparing a standard solution?
Beaker
Erlenmeyer flask
Volumetric flask
Graduated cylinder
1. Calculate the molarity of a solution made by dissolving 25.0 g of potassium hydroxide (KOH) in enough water to make 750 mL of solution.
2. How many grams of sodium chloride (NaCl) are needed to prepare 2.0 L of a 0.75 M solution?
3. If 150 mL of a 2.5 M stock solution of HCl is diluted to a final volume of 500 mL, what is the new molarity of the diluted solution?
1. Increasing the volume of a solution while keeping the moles of solute constant will increase its molarity.
True
False
2. Molarity is temperature-dependent because volume changes with temperature.
True
False
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