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Titration concentration

Quantitative chemistry
AQA 8462
ORIGINAL
Higher tier

moles = concentration x volume(dm3) [volume in cm3 → divide by 1000]

Convert cm^3 to dm^3, then start from the solution whose concentration and volume are both known.

Board and spec code confirmed against AQA 8462 · registry checked 2026-07-17How this checking works

Work it, then mark it

Do each calculation on paper first, then reveal the mark scheme and tick the marks you actually earned — the same way you should mark past papers.

Q1

In a titration, 25.0 cm3 of sodium hydroxide solution is exactly neutralised by 20.0 cm3 of 0.10 mol/dm3 hydrochloric acid. The equation is NaOH + HCl → NaCl + H2O. Calculate the concentration of the sodium hydroxide in mol/dm3.

[4 marks]

Total for this question: 4

Do the calculation on paper first — then mark it.

Where the marks get lost

  • Forgetting to divide the cm3 volume by 1000 to get dm3.
  • Using the wrong volume for the wrong chemical (25.0 goes with the NaOH, 20.0 with the HCl).
  • Ignoring the mole ratio from the balanced equation (it happens to be 1:1 here, but check every time).

Exam tip: Use moles = concentration x volume(in dm3). Start with whichever solution has both concentration and volume known — acid or alkali — then use the balanced-equation ratio and rearrange for the unknown.

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