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Cambridge IGCSE Chemistry practice

Paper 6 structured question: Preparation of salts

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Preparation of salts

Exam-style question

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Paper 6Alternative to PracticalPractical2 marks

Analysis of a precipitation reaction.

Results Table

Results of Precipitation Experiment

The table shows the mass of precipitate formed from different concentrations of reactants.

Concentration (mol/L)Mass of Precipitate (g)
0.10.5
0.21.0
0.31.5
0.42.0
  1. a

    Describe the trend in the results shown in the table.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Preparation of salts

Paper 6Alternative to PracticalPractical1 marks

Method

Method for Preparing Barium Sulfate

Mix equal volumes of barium chloride solution and sodium sulfate solution to form barium sulfate precipitate.

StepAction
1Measure equal volumes of barium chloride and sodium sulfate solutions.
2Mix the solutions in a beaker.
3Filter the mixture to collect the precipitate.
4Wash the precipitate with distilled water.
5Dry the precipitate.
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]