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Chemical changesTitrationApparatus

AQA GCSE · Question 02.3 · Chemical changes

A student determined the reacting volumes of hydrochloric acid and sodium hydroxide solution by titration. The method involved measuring 25.0 cm³ of the sodium hydroxide solution. Which piece of equipment should be used to measure 25.0 cm³ of the sodium hydroxide solution in step 1?

Answer options:

A.

Beaker

B.

Pipette

C.

Ruler

How to approach this question

Consider the precision required for a titration. The volume of one of the reactants must be measured very accurately. A beaker is for approximate volumes. A pipette is designed to measure a fixed, accurate volume.

Full Answer

B.Pipette✓ Correct
Pipette
In a titration, it is crucial to measure the initial volume of one of the reactants accurately. A volumetric pipette is specifically designed for this purpose. It allows for the precise measurement and transfer of a fixed volume of liquid (e.g., 25.0 cm³). A beaker provides only an approximate volume and is not suitable for titrations.

Common mistakes

✗ Choosing a beaker, which is not accurate enough.\n✗ Confusing a pipette with a burette (a burette measures variable volumes).
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