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 CuSO4​V = 150 mL

24.5 g of CuSO4 (M = 159.61 g/mol) is dissolved in water to make 150 mL of solution. Find the molarity c.

m = 24.5 gM = 159.61 g/molV = 150 mL
c = mol/L
2.Easy
100 mLc = 0.1 mol/L

What mass m of KNO3 (M = 101.1 g/mol) do you need to make 100 mL of a 0.1 mol/L solution?

V = 100 mLc = 0.1 mol/LM = 101.1 g/mol
m = g
3.Medium
1 mol/LV1​ = ?0.5 mol/L100 mL

You need 100 mL of 0.5 mol/L solution and have a 1 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 1 mol/Lc2 = 0.5 mol/LV2 = 100 mL
V1 = mL
4.Medium
5 mol/LV1​ = ?0.25 mol/L1000 mL

You need 1000 mL of 0.25 mol/L solution and have a 5 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 5 mol/Lc2 = 0.25 mol/LV2 = 1000 mL
V1 = mL
5.Hard
0.1 mol/L50 mL0.05 mol/L100 mLc = ?150 mL

50 mL of a 0.1 mol/L solution is mixed with 100 mL of a 0.05 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.1 mol/LV1 = 50 mLc2 = 0.05 mol/LV2 = 100 mL
c = mol/L
6.Hard
0.25 mol/L200 mL3 mol/L100 mLc = ?300 mL

200 mL of a 0.25 mol/L solution is mixed with 100 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.25 mol/LV1 = 200 mLc2 = 3 mol/LV2 = 100 mL
c = mol/L

Answer key

  1. 1. c = 1.023 mol/L
  2. 2. m = 1.011 g
  3. 3. V1 = 50 mL
  4. 4. V1 = 50 mL
  5. 5. c = 0.06667 mol/L
  6. 6. c = 1.167 mol/L

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