CIE Mar 2016 v3 Paper 3 Q3

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PMT 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 an 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. Marks are not given for chemical equations. 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.UCLES 2016 9701/33/F/M/16 [Turn over<br /> (a) FA 5 and FA 6 are solutions each containing one cation and one anion. Use a 1 cm depth of FA 5 or FA 6 in a test-tube to carry out the following tests on the two solutions and record your observations. PMT observations FA 5 FA 6 test Add aqueous sodium hydroxide. Add aqueous ammonia. Add a 1 cm depth of dilute hydrochloric acid, then transfer the mixture into a boiling tube and warm gently. Add two or three drops of acidified aqueous potassium manganate(VII). Add a 1 cm depth of aqueous barium chloride or barium nitrate, then add dilute hydrochloric acid. Identify as many of the ions present in FA 5 and FA 6 as possible from your observations. If you are unable to identify any of the ions from your observations, write unknown in the space. FA 5 FA 6 cation anion [8]UCLES 2016 9701/33/F/M/16<br /> PMT (b) FA 7 is a solid with an anion containing the same element as one of the anions in either FA 5 or FA 6 but in a different oxidation state. Relevant anions are listed in the Qualitative Analysis Notes on page 11. Place a spatula measure of FA 7 in a boiling tube and add a 2 cm depth of distilled water. Shake the boiling tube to dissolve the solid and make a solution of FA 7. (i) Select reagents to test whether the anion in FA 7 contains the same element as the anion in FA 5. Carry out your test(s) on the solution of FA 7 and record your observations and conclusions in a suitable form in the space below. reagents for testing FA 7observations and conclusions (ii) Select reagents to test whether the anion in FA 7 contains the same element as the anion in FA 6. Carry out your test(s) on the solution of FA 7 and record your observations and conclusions in a suitable form in the space below. reagents for testing FA 7observations and conclusionsUCLES 2016 9701/33/F/M/16 [5] [Total: 13] [Turn over<br />

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