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
31 g C6​H12​O6​V = 200 mL

31 g of C6H12O6 (M = 180.16 g/mol) is dissolved in water to make 200 mL of solution. Find the molarity c.

m = 31 gM = 180.16 g/molV = 200 mL
c = mol/L
2.Easy
24 g C6​H12​O6​V = 1000 mL

24 g of C6H12O6 (M = 180.16 g/mol) is dissolved in water to make 1000 mL of solution. Find the molarity c.

m = 24 gM = 180.16 g/molV = 1000 mL
c = mol/L
3.Medium
2.5 mol/LV1​0.25 mol/L200 mL

You need 200 mL of 0.25 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 = 0.25 mol/LV2 = 200 mL
Vwater = mL
4.Medium
6 mol/LV1​ = ?0.25 mol/L100 mL

You need 100 mL of 0.25 mol/L solution and have a 6 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 6 mol/Lc2 = 0.25 mol/LV2 = 100 mL
V1 = mL
5.Hard
2 mol/L200 mL0.05 mol/L500 mLc = ?700 mL

200 mL of a 2 mol/L solution is mixed with 500 mL of a 0.05 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 2 mol/LV1 = 200 mLc2 = 0.05 mol/LV2 = 500 mL
c = mol/L
6.Hard
0.8 mol/L200 mL3 mol/L250 mLc = ?450 mL

200 mL of a 0.8 mol/L solution is mixed with 250 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.8 mol/LV1 = 200 mLc2 = 3 mol/LV2 = 250 mL
c = mol/L

Answer key

  1. 1. c = 0.8603 mol/L
  2. 2. c = 0.1332 mol/L
  3. 3. Vwater = 180 mL
  4. 4. V1 = 4.167 mL
  5. 5. c = 0.6071 mol/L
  6. 6. c = 2.022 mol/L

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