CIE Jun 2016 v5 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. 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) (i) FA 6 is a salt containing one cation and one anion from those listed on pages 14 and 15. Transfer a small spatula measure of FA 6 into a hard-glass test-tube. Heat gently at first, then heat strongly until no further change occurs. Record all your observations below.UCLES 2016 9701/35/M/J/16<br /> (ii) Dissolve the remainder of FA 6 in an approximate depth of 5 cm of distilled water in a boiling tube for use in the following tests. Record your observations in the table below. test observations PMT To a 1 cm depth of the solution of FA 6 in a test-tube, add an equal volume of FA 1, aqueous sulfuric acid. To a 1 cm depth of the solution of FA 6 in a test-tube, add aqueous ammonia. To a 1 cm depth of the solution of FA 6 in a boiling tube, add aqueous sodium hydroxide, then heat the mixture, gently and carefully, then place the boiling tube in a rack and add aluminium foil. (iii) Give the chemical formula of FA 6.Give the ionic equation for the reaction of FA 6 with cold sodium hydroxide. Include state symbols.[8]UCLES 2016 9701/35/M/J/16 [Turn over<br /> PMT 10 (b) (i) FA 7 is a solution containing one cation and one anion from the list on pages 14 and 15. Carry out the following tests and record your observations in the table below. test observations To a 1 cm depth of FA 7 in a test-tube, add aqueous sodium hydroxide. To a 1 cm depth of FA 7 in a test-tube, add aqueous ammonia. To a 1 cm depth of FA 7 in a test-tube, add a few drops of acidified potassium manganate(VII), followed by a few drops of aqueous starch. (ii) Identify FA 7. FA 7 is(iii) Carry out one further test of your choice to confirm the identity of the anion in FA 7. reagent(s) usedobservation(s)[5] [Total: 13]UCLES 2016 9701/35/M/J/16<br />

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