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Cambridge IGCSE Chemistry practice

Paper 6 structured question: Preparation of salts

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Preparation of salts

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Results from the preparation of a soluble salt.

Results Table

Results of Titration Experiment

The table below shows the results of a titration experiment to prepare sodium chloride.

Volume of NaOH (cm³)pH
103
207
3010
  1. a

    Describe the trend in pH as the volume of NaOH increases.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Preparation of salts

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Method

Method for Preparing a Soluble Salt

To prepare sodium chloride from hydrochloric acid and sodium hydroxide, follow these steps: 1. Measure a specific volume of hydrochloric acid using a pipette. 2. Add a few drops of phenolphthalein indicator. 3. Titrate with sodium hydroxide until the solution turns pink, indicating neutralization. 4. Filter the solution to remove any unreacted sodium hydroxide. 5. Evaporate the filtrate to obtain sodium chloride crystals.

  1. a

    State Identify the independent variable in this method.

    Aim for approximately 1 distinct marking point.

    [1]