CIE Mar 2017 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. 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 2017 9701/33/F/M/17 [Turn over<br /> (a) FA 5, FA 6 and FA 7 are solutions, some of which contain ions that are listed on pages 10 and 11. PMT FA 5 observations FA 6 FA 7 test (i) To a 0.5 cm depth of solution in a boiling tube add aqueous sodium hydroxide, then warm gently. Allow to cool, add a piece of aluminium foil and warm again. (ii) (iii) (iv) To a 1 cm depth of solution in a test-tube add two or three drops of acidified aqueous potassium manganate(VII). (Do not use FA 3.) If no reaction occurs, pour the mixture into a boiling tube and warm gently. To a 1 cm depth of solution in a test-tube add a 2 cm depth of 10 volume hydrogen peroxide and leave to stand. (Do not use FA 1.) To a 1 cm depth of solution in a test-tube add a 1 cm depth of dilute hydrochloric acid, then add a 1 cm depth of aqueous barium chloride or aqueous barium nitrate.UCLES 2017 9701/33/F/M/17 [11]<br /> (b) (i) Identify as many ions present in FA 5, FA 6 and FA 7 as possible from your observations. If an ion cannot be identified from the tests, write unknown in the space. cation(s) anion(s) PMT FA 5 FA 6 FA 7 (ii) Describe another test you could carry out to confirm the identity of a cation you have identified in (i). Record the reagent(s) and expected observation(s) in the space below. Do not carry out this test. (iii) Write an ionic equation for the reaction that would occur in (ii). Include state symbols.[6] [Total:17]UCLES 2017 9701/33/F/M/17 [Turn over<br />

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