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
1000 mLc = 0.2 mol/L

What mass m of C6H12O6 (M = 180.16 g/mol) do you need to make 1000 mL of a 0.2 mol/L solution?

V = 1000 mLc = 0.2 mol/LM = 180.16 g/mol
m = g
2.Easy
500 mLc = 0.15 mol/L

What mass m of KNO3 (M = 101.1 g/mol) do you need to make 500 mL of a 0.15 mol/L solution?

V = 500 mLc = 0.15 mol/LM = 101.1 g/mol
m = g
3.Medium
2 mol/LV1​0.4 mol/L100 mL

You need 100 mL of 0.4 mol/L solution and have a 2 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 2 mol/Lc2 = 0.4 mol/LV2 = 100 mL
Vwater = mL
4.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. How much water Vwater do you add to the stock solution?

c1 = 1 mol/Lc2 = 0.05 mol/LV2 = 200 mL
Vwater = mL
5.Hard
0.4 mol/L50 mL3 mol/L500 mLc = ?550 mL

50 mL of a 0.4 mol/L solution is mixed with 500 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.4 mol/LV1 = 50 mLc2 = 3 mol/LV2 = 500 mL
c = mol/L
6.Hard
0.5 mol/L100 mL3 mol/L50 mLc = ?150 mL

100 mL of a 0.5 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 = 0.5 mol/LV1 = 100 mLc2 = 3 mol/LV2 = 50 mL
c = mol/L

Answer key

  1. 1. m = 36.03 g
  2. 2. m = 7.582 g
  3. 3. Vwater = 80 mL
  4. 4. Vwater = 190 mL
  5. 5. c = 2.764 mol/L
  6. 6. c = 1.333 mol/L

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