CAIE IGCSE Chemistry Burette Pipette and Indicator Titration

Practise describing an acid–base titration with a volumetric pipette, burette and suitable indicator and selecting concordant titres accurately.

Exam points

use a volumetric pipette for the fixed aliquot and a burette for the variable titrant volume
add a suitable indicator and approach the end-point dropwise while swirling the flask
repeat until concordant titres are obtained and calculate a mean from consistent results

[Maximum number: 1]

Dilute sulfuric acid and aqueous sodium hydroxide can be used to prepare sodium sulfate crystals using a method that involves titration.

Figure for Question 12.2.1—An acid–base titration to include the question 1 — CAIE IGCSE Chemistry

Name an indicator that can be used in this titration.
$20.0 \mathrm{~cm}^{3}$ of dilute sulfuric acid neutralises $25.0 \mathrm{~cm}^{3}$ of $1.00 \mathrm{~mol} / \mathrm{dm}^{3}$ aqueous sodium hydroxide. At the end of the titration the conical flask contains aqueous sodium sulfate with the dissolved indicator as an impurity.

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12.2.1—An acid–base titration to include the question 1