Molarity & dilution worksheet with answers

Free printable Molarity & dilution worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
24.5 g CaCl2​V = 150 mL

24.5 g of CaCl2 (M = 110.98 g/mol) is dissolved in water to make 150 mL of solution. Find the molarity c.

m = 24.5 gM = 110.98 g/molV = 150 mL
c = mol/L
2.Easy
26.5 g KMnO4​V = 200 mL

26.5 g of KMnO4 (M = 158.03 g/mol) is dissolved in water to make 200 mL of solution. Find the molarity c.

m = 26.5 gM = 158.03 g/molV = 200 mL
c = mol/L
3.Medium
1 mol/LV1​ = ?0.05 mol/L200 mL

You need 200 mL of 0.05 mol/L solution and have a 1 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 1 mol/Lc2 = 0.05 mol/LV2 = 200 mL
V1 = mL
4.Medium
2.5 mol/LV1​ = ?0.3 mol/L200 mL

You need 200 mL of 0.3 mol/L solution and have a 2.5 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 2.5 mol/Lc2 = 0.3 mol/LV2 = 200 mL
V1 = mL
5.Hard
0.2 mol/L300 mL3 mol/L50 mLc = ?350 mL

300 mL of a 0.2 mol/L solution is mixed with 50 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.2 mol/LV1 = 300 mLc2 = 3 mol/LV2 = 50 mL
c = mol/L
6.Hard
0.8 mol/L300 mL0.05 mol/L200 mLc = ?500 mL

300 mL of a 0.8 mol/L solution is mixed with 200 mL of a 0.05 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.8 mol/LV1 = 300 mLc2 = 0.05 mol/LV2 = 200 mL
c = mol/L

Answer key

  1. 1. c = 1.472 mol/L
  2. 2. c = 0.8384 mol/L
  3. 3. V1 = 10 mL
  4. 4. V1 = 24 mL
  5. 5. c = 0.6 mol/L
  6. 6. c = 0.5 mol/L

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