Molarity and Dilution Practice
This worksheet provides practice problems for calculating molarity and performing dilution calculations, suitable for Grade 11 Chemistry students.
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Molarity and Dilution Practice
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. Calculate the molarity of a solution prepared by dissolving 25.0 g of NaCl in enough water to make 500.0 mL of solution. (Molar mass of NaCl = 58.44 g/mol)
2. How many grams of potassium iodide (KI) are needed to prepare 2.5 L of a 0.75 M solution? (Molar mass of KI = 166.00 g/mol)
3. Molarity is defined as the number of of solute per liter of .
4. When diluting a solution, the number of moles of solute , while the volume of the solution .
5. Which of the following equations is used for dilution calculations?
M = n/V
M1V1 = M2V2
PV = nRT
pH = -log[H+]
6. If you have 100.0 mL of a 2.0 M stock solution of HCl, how much water do you need to add to dilute it to a 0.50 M solution?
7. A chemist wants to prepare 250.0 mL of a 0.15 M NaOH solution from a 6.0 M stock solution. What volume of the stock solution is needed?
8. Adding more solvent to a solution increases its molarity.
True
False
9. The total number of moles of solute remains constant during a dilution.
True
False