Qualitative Analysis At each stage of any test you are to record details of the following. - colour changes seen - the formation of any precipitate - the solubility of such precipitates in excess of the reagent added Where gases are released they should be identified by a test, described in the appropriate place in your observations. You should indicate clearly at what stage in a test a change occurs. No additional tests for ions present should be attempted. If any solution is warmed, a boiling tube MUST be used. Rinse and reuse test-tubes and boiling tubes where possible. Where reagents are selected for use in a test, the name or correct formula of the element or compound must be given.

A-Level CIE Chemistry 6.3 Reactions of Ions in Aqueous Solution (A Level only): Qualitative Analysis At each st

Qualitative Analysis At each stage of any test you are to record details of the following - CIE - A-Level Chemistry - Question 3 - 2015 - Paper 1

Question 3

Qualitative Analysis At each stage of any test you are to record details of the following. - colour changes seen - the formation of any precipitate - the solubilit... show full transcript

Worked Solution & Example Answer:Qualitative Analysis At each stage of any test you are to record details of the following - CIE - A-Level Chemistry - Question 3 - 2015 - Paper 1

Step 1

colour changes seen

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Answer

In the qualitative analysis, observe and note any visible color changes during the tests. For example, when mixing certain reactants, the solution may change from colorless to light brown or yellow, indicating a chemical reaction taking place.

Step 2

the formation of any precipitate

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Answer

Document the formation of any precipitates observed during the testing process. This could include noting whether a solid forms upon the addition of a reagent, such as the appearance of a white or yellow precipitate when sodium hydroxide is added.

Step 3

the solubility of such precipitates in excess of the reagent added

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Answer

Evaluate and record the solubility behavior of any precipitates when excess reagent is introduced. For instance, if a white precipitate forms and remains unchanged after adding more reagent, this indicates the precipitate is insoluble in that solution.

Step 4

gas released identification

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Answer

When gases are released during any reaction, identify them by conducting a test specific to the gas. For example, testing for hydrogen gas using a lit splint that produces a 'pop' sound is a reliable method of identification.

Qualitative Analysis At each stage of any test you are to record details of the following - CIE - A-Level Chemistry - Question 3 - 2015 - Paper 1

Worked Solution & Example Answer:Qualitative Analysis At each stage of any test you are to record details of the following - CIE - A-Level Chemistry - Question 3 - 2015 - Paper 1

colour changes seen

the formation of any precipitate

the solubility of such precipitates in excess of the reagent added

gas released identification

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