Cambridge IGCSE Chemistry practice

Paper 6 structured question: Acid-base titrations

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At a glance

Paper

Marks

Topic

Acid-base titrations

Exam-style question

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Paper 6Alternative to PracticalPractical2 marks

A student records the results of several titrations to find the average volume of titrant used.

Results Table

The table shows the volumes of sodium hydroxide used in three titrations.

a
Calculate the average volume of sodium hydroxide used in the titrations.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 6Alternative to PracticalPractical1 marks

Method

The student adds sodium hydroxide to hydrochloric acid until the indicator changes color.

Step	Action
1	Fill a burette with sodium hydroxide.
2	Add a few drops of phenolphthalein to the acid.
3	Slowly add sodium hydroxide to the acid while swirling.
4	Stop when the solution turns pink.

a
Identify the independent variable in this titration method.
Your answer
Aim for approximately 1 distinct marking point.
[1]