Qualitative Analysis
Where reagents are selected for use in a test, the name or correct formula of the element or compound must be given.
At each stage of any test you are to record details of the following:
• colour changes seen;
• the formation of any precipitate and its solubility in an excess of the reagent added;
• the formation of any gas and its identification by a suitable test.
You should indicate clearly at what stage in a test a change occurs.
If any solution is warmed, a boiling tube must be used.
Rinse and reuse test-tubes and boiling tubes where possible.
No additional tests for ions present should be attempted.

Q: What topic does this question test?

This question tests Analytical techniques in A-Level Chemistry (syllabus code 9701). It is worth 16 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2018 examination, Paper 3 Variant 3 (9701_m18_qp_33.pdf).

Question

Qualitative Analysis
Where reagents are selected for use in a test, the name or correct formula of the element or compound must be given.
At each stage of any test you are to record details of the following:
• colour changes seen;
• the formation of any precipitate and its solubility in an excess of the reagent added;
• the formation of any gas and its identification by a suitable test.
You should indicate clearly at what stage in a test a change occurs.
If any solution is warmed, a boiling tube must be used.
Rinse and reuse test-tubes and boiling tubes where possible.
No additional tests for ions present should be attempted.

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