Molarity Practice Worksheet
A Grade 11 Chemistry worksheet focusing on calculating molarity, preparing solutions, and understanding dilution.
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Molarity Practice Worksheet
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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.
1. Calculate the molarity of a solution prepared by dissolving 25.0 g of NaOH (molar mass = 40.00 g/mol) in enough water to make 500.0 mL of solution.
2. How many grams of potassium chloride (KCl, molar mass = 74.55 g/mol) are needed to prepare 2.5 L of a 0.50 M solution?
3. Molarity is defined as the number of of solute per liter of .
4. To increase the concentration (molarity) of a solution, you can either add more or decrease the volume of the .
5. Which of the following glassware is most appropriate for preparing a solution of a precise molarity?
Beaker
Erlenmeyer flask
Graduated cylinder
Volumetric flask
6. A 1.0 M solution of NaCl contains:
1.0 gram of NaCl in 1.0 L of solution
1.0 mole of NaCl in 1.0 L of water
1.0 mole of NaCl in 1.0 L of solution
1.0 gram of NaCl in 1.0 kg of water
7. If you have 250.0 mL of a 6.0 M HCl solution, and you dilute it to a final volume of 1.0 L, what is the new molarity of the solution?
8. How much water must be added to 100.0 mL of a 0.75 M stock solution to prepare a 0.25 M solution?
9. Describe the steps you would take to prepare 250.0 mL of a 0.10 M CuSO₄ solution in a laboratory. You have solid CuSO₄ (molar mass = 159.61 g/mol) and distilled water available. Include the necessary equipment.
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