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
8.5 g CuSO4​V = 200 mL

8.5 g of CuSO4 (M = 159.61 g/mol) is dissolved in water to make 200 mL of solution. Find the molarity c.

m = 8.5 gM = 159.61 g/molV = 200 mL
c = mol/L
2.Easy
12.5 g CaCl2​V = 250 mL

12.5 g of CaCl2 (M = 110.98 g/mol) is dissolved in water to make 250 mL of solution. Find the molarity c.

m = 12.5 gM = 110.98 g/molV = 250 mL
c = mol/L
3.Medium
6 mol/LV1​0.4 mol/L100 mL

You need 100 mL of 0.4 mol/L solution and have a 6 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 6 mol/Lc2 = 0.4 mol/LV2 = 100 mL
Vwater = mL
4.Medium
1.5 mol/LV1​ = ?0.1 mol/L100 mL

You need 100 mL of 0.1 mol/L solution and have a 1.5 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 1.5 mol/Lc2 = 0.1 mol/LV2 = 100 mL
V1 = mL
5.Hard
0.8 mol/L50 mL0.75 mol/L200 mLc = ?250 mL

50 mL of a 0.8 mol/L solution is mixed with 200 mL of a 0.75 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.8 mol/LV1 = 50 mLc2 = 0.75 mol/LV2 = 200 mL
c = mol/L
6.Hard
0.8 mol/L300 mL0.75 mol/L250 mLc = ?550 mL

300 mL of a 0.8 mol/L solution is mixed with 250 mL of a 0.75 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.8 mol/LV1 = 300 mLc2 = 0.75 mol/LV2 = 250 mL
c = mol/L

Answer key

  1. 1. c = 0.2663 mol/L
  2. 2. c = 0.4505 mol/L
  3. 3. Vwater = 93.33 mL
  4. 4. V1 = 6.667 mL
  5. 5. c = 0.76 mol/L
  6. 6. c = 0.7773 mol/L

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