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
13.5 g NaOHV = 250 mL

13.5 g of NaOH (M = 40 g/mol) is dissolved in water to make 250 mL of solution. Find the molarity c.

m = 13.5 gM = 40 g/molV = 250 mL
c = mol/L
2.Easy
28.5 g CuSO4​V = 100 mL

28.5 g of CuSO4 (M = 159.61 g/mol) is dissolved in water to make 100 mL of solution. Find the molarity c.

m = 28.5 gM = 159.61 g/molV = 100 mL
c = mol/L
3.Medium
0.5 mol/LV1​0.05 mol/L100 mL

You need 100 mL of 0.05 mol/L solution and have a 0.5 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 0.5 mol/Lc2 = 0.05 mol/LV2 = 100 mL
Vwater = mL
4.Medium
0.5 mol/LV1​0.1 mol/L200 mL

You need 200 mL of 0.1 mol/L solution and have a 0.5 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 0.5 mol/Lc2 = 0.1 mol/LV2 = 200 mL
Vwater = mL
5.Hard
0.1 mol/L300 mL2.5 mol/L100 mLc = ?400 mL

300 mL of a 0.1 mol/L solution is mixed with 100 mL of a 2.5 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.1 mol/LV1 = 300 mLc2 = 2.5 mol/LV2 = 100 mL
c = mol/L
6.Hard
1.5 mol/L250 mL3 mol/L200 mLc = ?450 mL

250 mL of a 1.5 mol/L solution is mixed with 200 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 1.5 mol/LV1 = 250 mLc2 = 3 mol/LV2 = 200 mL
c = mol/L

Answer key

  1. 1. c = 1.35 mol/L
  2. 2. c = 1.786 mol/L
  3. 3. Vwater = 90 mL
  4. 4. Vwater = 160 mL
  5. 5. c = 0.7 mol/L
  6. 6. c = 2.167 mol/L

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