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
500 mLc = 0.2 mol/L

What mass m of C6H12O6 (M = 180.16 g/mol) do you need to make 500 mL of a 0.2 mol/L solution?

V = 500 mLc = 0.2 mol/LM = 180.16 g/mol
m = g
2.Easy
500 mLc = 0.25 mol/L

What mass m of Na2CO3 (M = 105.99 g/mol) do you need to make 500 mL of a 0.25 mol/L solution?

V = 500 mLc = 0.25 mol/LM = 105.99 g/mol
m = g
3.Medium
1 mol/LV1​ = ?0.25 mol/L200 mL

You need 200 mL of 0.25 mol/L solution and have a 1 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 1 mol/Lc2 = 0.25 mol/LV2 = 200 mL
V1 = mL
4.Medium
3 mol/LV1​ = ?0.4 mol/L1000 mL

You need 1000 mL of 0.4 mol/L solution and have a 3 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 3 mol/Lc2 = 0.4 mol/LV2 = 1000 mL
V1 = mL
5.Hard
0.8 mol/L250 mL1.2 mol/L100 mLc = ?350 mL

250 mL of a 0.8 mol/L solution is mixed with 100 mL of a 1.2 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.8 mol/LV1 = 250 mLc2 = 1.2 mol/LV2 = 100 mL
c = mol/L
6.Hard
1 mol/L150 mL1.2 mol/L400 mLc = ?550 mL

150 mL of a 1 mol/L solution is mixed with 400 mL of a 1.2 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 1 mol/LV1 = 150 mLc2 = 1.2 mol/LV2 = 400 mL
c = mol/L

Answer key

  1. 1. m = 18.02 g
  2. 2. m = 13.25 g
  3. 3. V1 = 50 mL
  4. 4. V1 = 133.3 mL
  5. 5. c = 0.9143 mol/L
  6. 6. c = 1.145 mol/L

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