CIE Nov 2014 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 identi ed 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 2014 9701/35/O/N/14 [Turn over<br /> (a) FA 7 and FA 8 are mixtures. Each mixture contains one cation and two anions from those listed on pages 12 and 13. Carry out the following tests and record all your observations in the table below. 10 PMT observations FA 7 FA 8 No observation required. Do not carry out this test. Do not carry out this test. test (i) Place a spatula measure of FA 7 or FA 8 into a boiling tube, then add approximately 5 cm3 of dilute nitric acid using the measuring cylinder. (Do not use FA 2 as the dilute nitric acid.) Then add about 5 cm3 of distilled water and shake to mix the solution. Use a 1 cm depth of the solution obtained in a test-tube for each of tests (ii)(v). (ii) Add aqueous sodium hydroxide. (iii) Add aqueous ammonia. (iv) Add aqueous barium nitrate followed by dilute nitric acid. (v) Add aqueous silver nitrate followed by aqueous ammonia.UCLES 2014 9701/35/O/N/14<br /> PMT 11 (vi) Use your observations to identify the following ions. FA 7 contains cationFA 7 contains anionsandFA 8 contains anionsandState and explain all the evidence for your identi cation of the cation in FA 7.[7] (b) FA 9 contains two cations from the list on page 12. (i) Transfer approximately half of the FA 9 into a hard-glass test-tube and heat gently atrst, and then strongly, until no further change is seen. Test with litmus papers while you are heating. Record all your observations below.(ii) Carry out further tests that will enable you to identify both cations in FA 9. Describe your tests brie y and state your observations. FA 9 contains cationsand[5]UCLES 2014 9701/35/O/N/14 [Total: 12] [Turn over<br />

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