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Cambridge IGCSE Chemistry practice

Paper 6 structured question: Acid-base titrations

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Acid-base titrations

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Paper 6Alternative to PracticalPractical2 marks

Acid-base titration experiment

Method

Titration Method

In a titration, a known volume of acid is placed in a flask. A burette is filled with a base of known concentration. An indicator is added to the acid. The base is slowly added from the burette to the acid until the indicator changes color, indicating the endpoint.

  1. a

    Describe the role of the burette in this titration method.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Acid-base titrations

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Results Table

Titration Results

The table below shows the results of three titrations performed to determine the concentration of hydrochloric acid.

TrialVolume of NaOH added (cm³)pH at endpoint
125.07.0
225.17.0
325.07.0
  1. a

    State the average volume of NaOH used in the titrations.

    Aim for approximately 1 distinct marking point.

    [1]