Calculating Concentration

AQA-style Exam Question

A 50 cm³ sample of nickel sulfate solution contains 8.5 g of solute. Calculate the concentration of the solution in g/dm³.

[3 marks]

• Based on the highlighted values, what equation do we need?

  Mass of solute (g) = Concentration (g/dm³) x Volume of solution (dm³)

• Put values in a table and check UNITS! What needs converting? (1 mark)

  Volume should be in dm³

  We know that 1000cm³ = 1 dm³ (memorise this!)

  So, 50/1000 = 0.05 dm³

  (1 mark)

• How do we find concentration? (2 marks)

  Mass/ Volume

  8.5/0.05

  (1 mark)

  = 170 g/dm³

  (1 mark)

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