Edexcel IGCSE Chemistry 2.33C acid-alkali titration

Practise titration questions by reading burettes, selecting concordant titres and improving endpoint technique with suitable apparatus.

Exam points

Choose pipettes, burettes, white tiles and indicators for accurate titration work.
Read burette diagrams to 0.05 cm3 and subtract initial from final readings.
Select concordant titres and calculate a mean volume to the required precision.

[Maximum number: 6]

Sodium sulfate can be prepared by the reaction between sodium hydroxide solution and sodium hydrogensulfate ( $\mathrm{NaHSO}_{4}$ ) solution.

This is the equation for the reaction.

\mathrm{NaOH}(\mathrm{aq})+\mathrm{NaHSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})

Sodium hydrogensulfate solution is acidic.
A student adds $25.0 \mathrm{~cm}^{3}$ of sodium hydroxide solution to a conical flask and adds two drops of indicator.

The student does a titration.

(a)

Name a piece of apparatus that should be used to add $25.0 \mathrm{~cm}^{3}$ of sodium hydroxide solution to the conical flask.

[ 1 ]

(b)

Describe the method the student should use to find the accurate volume of sodium hydrogensulfate solution needed to neutralise the 25.0 cm3 of sodium hydroxide solution.

[ 5 ]

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2.33C Carry out an acid-alkali titration question 1

Question (a)

Question (b)