Edexcel IAL Chemistry 6.P11 laboratory apparatus and techniques

Questions ask for named apparatus and diagram checks: choose a measuring cylinder or teat pipette, identify a pestle and mortar and repair reduced-pressure filtration setups.

Exam points

Choose apparatus such as a teat pipette, measuring cylinder or pestle and mortar.
Label Buchner funnel, filter paper, side-arm flask and pump in suction filtration.
Identify missing filter paper, side arm or pump connection in filtration diagrams.

[Maximum number: 1]

This question is about copper and some of its compounds.

Brass is an alloy of copper and zinc.

A student determined the percentage of copper in a sample of brass.

Procedure
- weigh the sample of brass
- place the brass in a beaker and add concentrated nitric acid until all the brass dissolves
- transfer the solution and washings to a $250.0 \mathrm{~cm}^{3}$ volumetric flask
- make the solution up to the mark with distilled water and mix well
- pipette $25.0 \mathrm{~cm}^{3}$ of the solution into a conical flask
- neutralise the excess nitric acid in the solution
- add $10 \mathrm{~cm}^{3}$ of potassium iodide solution (an excess) to the conical flask
- titrate the iodine produced with $0.100 \mathrm{~mol} \mathrm{dm}^{-3}$ sodium thiosulfate solution using starch indicator
- repeat the titration until concordant titres are obtained.

Name the most suitable piece of apparatus to measure the $10 \mathrm{~cm}^{3}$ of potassium iodide solution.

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6.P11—Selecting laboratory apparatus question 1