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OCR GCSE Chemistry Titrations

Titrations

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Titrations are a laboratory method of quantifying the concentration of a solution.

Methods of titration

This is a diagram of a titration set up.

Titration experimental set up

The result of the titration can be used to calculate the previously unkown concentration of the solution. Using the known volume and concentration from the titrant, and the ratio of moles between the two solutions in a neutralisation reaction, the concentration of the solution can be found.

Titration calculations

Titration with a weak acid, (e.g. CH₃COOH) and a strong base (e.g. NaOH) would give a titration curve. In the case where one of either acid or base is weak, and the other is strong then the equivalence point is not at pH 7.

Titration calculations

During titrations, acid-base indicators are used to indicate a neturalisation reaction has taken place. The acid and base forms of the indicator have different colours thus a colour change indicates the reation change.

Indicators

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