The Physics Question Bank

Titration Calculations

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Use titration results to find the concentration of an acid or an alkali, in mol/dm³ and in g/dm³. This is chemistry-only (separate science) content for Higher tier.

The rules
  1. Use the mean of the concordant titres. Concordant results are within 0.10 cm³ of each other. Ignore the rough titre and any anomalous result.
  2. moles = concentration × volume in dm³. Divide cm³ by 1000 to get dm³. Then concentration = moles ÷ volume in dm³.
  3. Use the balanced equation for the mole ratio. In 2NaOH + H2SO4, 1 mol of acid reacts with 2 mol of alkali.
  4. concentration in g/dm³ = concentration in mol/dm³ × Mr.
Topic
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Worked solution

    Relative atomic masses are the AQA values: H 1, C 12, N 14, O 16, Na 23, S 32, Cl 35.5, K 39. Titration calculations are in AQA GCSE Chemistry (Higher tier), not Combined Science.

    Answers within 1% are marked correct (0.6% when you work from a table of titres, so you can see if you used the wrong ones). Mean titres must be correct to 2 decimal places.

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