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3.4 Using concentrations of solutions in mol/dm3

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Question 22
H

A student added water to 100 cm3 of a solution of potassium nitrate and calculated the concentration of the solution after each addition of water.

The figure shows the student's results.

Figure: The concentration of the solution plotted against the total volume of the solution

A decreasing curve shows the concentration of a potassium nitrate solution against its total volume, with plotted crosses at 100, 200, 400 and 500 cm³.

a.

Use the figure to determine the concentration of the solution when the total volume of the solution is 250 cm3.

[1]
b.

Calculate the amount, in mol\text{mol}mol, of potassium nitrate in the solution at the start.

[2]
c.

Explain the shape of the curve.

[2]
Markscheme

3.4 Using concentrations of solutions in mol/dm3 Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Using concentrations of solutions in mol/dm3

106 exam-style questions on AQA GCSE Chemistry 3.4 Using concentrations of solutions in mol/dm3, covering 3.4.1 Concentration in mol/dm3. Each one has a worked solution and a mark scheme showing where the marks go.

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