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3.2 Use of amount of substance in relation to masses of pure substances

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Question 48

A technician has 120 cm3 of sodium hydroxide solution with a concentration of 45 g/dm3.

The technician adds 180 cm3 of water. Assume that the final volume is the sum of the two volumes.

Solution X has a concentration of 15 g/dm3.

a.

Calculate the concentration of the sodium hydroxide solution after the water is added.

Give your answer in g/dm3\text{g/dm}^3g/dm3.

[5]
b.

A second technician says:

“Because water was added, the diluted sodium hydroxide solution must be less concentrated than solution X.”

Explain whether the second technician is correct.

[3]
Markscheme

3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

131 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles, 3.2.2 Amounts of substances in equations, 3.2.3 Using moles to balance equations, 3.2.4 Limiting reactants, 3.2.5a Concentration of solutions, and 3.2.5b Relating mass, volume and concentration. Each one has a worked solution and a mark scheme showing where the marks go.

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