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
17.5 g C6​H12​O6​V = 100 mL

17.5 g of C6H12O6 (M = 180.16 g/mol) is dissolved in water to make 100 mL of solution. Find the molarity c.

m = 17.5 gM = 180.16 g/molV = 100 mL
c = mol/L
2.Easy
22.5 g C6​H12​O6​V = 500 mL

22.5 g of C6H12O6 (M = 180.16 g/mol) is dissolved in water to make 500 mL of solution. Find the molarity c.

m = 22.5 gM = 180.16 g/molV = 500 mL
c = mol/L
3.Medium
3 mol/LV1​0.5 mol/L200 mL

You need 200 mL of 0.5 mol/L solution and have a 3 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 3 mol/Lc2 = 0.5 mol/LV2 = 200 mL
Vwater = mL
4.Medium
2.5 mol/LV1​0.05 mol/L1000 mL

You need 1000 mL of 0.05 mol/L solution and have a 2.5 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 2.5 mol/Lc2 = 0.05 mol/LV2 = 1000 mL
Vwater = mL
5.Hard
0.1 mol/L100 mL1.2 mol/L200 mLc = ?300 mL

100 mL of a 0.1 mol/L solution is mixed with 200 mL of a 1.2 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.1 mol/LV1 = 100 mLc2 = 1.2 mol/LV2 = 200 mL
c = mol/L
6.Hard
1 mol/L200 mL0.3 mol/L50 mLc = ?250 mL

200 mL of a 1 mol/L solution is mixed with 50 mL of a 0.3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 1 mol/LV1 = 200 mLc2 = 0.3 mol/LV2 = 50 mL
c = mol/L

Answer key

  1. 1. c = 0.9714 mol/L
  2. 2. c = 0.2498 mol/L
  3. 3. Vwater = 166.7 mL
  4. 4. Vwater = 980 mL
  5. 5. c = 0.8333 mol/L
  6. 6. c = 0.86 mol/L

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