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Cambridge IGCSE Chemistry practice

Paper 6 structured question: The mole and the Avogadro constant

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Topic

The mole and the Avogadro constant

Exam-style question

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Paper 6Alternative to PracticalPractical2 marks

A student records the results of a titration in a table.

Results Table

Titration Results

TrialVolume of NaOH (cm³)Concentration of HCl (mol/dm³)
125.00.1
225.00.1
325.00.1
  1. a

    Calculate the average concentration of hydrochloric acid based on the results provided.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: The mole and the Avogadro constant

Paper 6Alternative to PracticalPractical1 marks

Method

Titration Method

1. Fill a burette with sodium hydroxide solution. 2. Measure 25.0 cm³ of hydrochloric acid into a conical flask. 3. Add a few drops of phenolphthalein indicator to the acid. 4. Slowly add sodium hydroxide from the burette to the acid while swirling the flask until the solution turns pink, indicating the endpoint.

  1. a

    State the independent variable in this titration experiment.

    Aim for approximately 1 distinct marking point.

    [1]