CIE Jun 2014 v3 Paper 3 Q3

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Qualitative Analysis PMT 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. (a) FA 4, FA 5 and FA 6 are solutions, each containing one transition metal ion. One of the solutions also contains the ammonium ion. All the cations present are listed in the Qualitative Analysis Notes on page 10. (i) Carry out the following tests on the three solutions. observations II III IV test To a 1 cm depth of FA 4 in a test-tube, add FA 1, aqueous potassium manganate(VII), dropwise. To a 1 cm depth of FA 5 in a test-tube, add FA 1, aqueous potassium manganate(VII), dropwise. To a 1 cm depth of FA 6 in a test-tube, add FA 1, aqueous potassium manganate(VII), dropwise. (ii) State which solution(s) contain ions which have been oxidised.[4]UCLES 2014 9701/33/M/J/14 [Turn over<br /> (b) (i) Select a reagent or reagents to identify all the cations present in the three solutions. reagent(s)Carry out experiments using your reagent(s) on each of FA 4, FA 5 and FA 6 and record your observations in a suitable form in the space below. PMT (ii) Use your observations to identify the cations present in the three solutions. FA 4 containsFA 5 containsFA 6 contains[8] II III IV VI VII VIIIUCLES 2014 9701/33/M/J/14<br /> PMT (c) Each of the solutions FA 4, FA 5 and FA 6 contains either a chloride or a sulfate ion. (i) Choose a reagent or reagents to identify which solution(s) contain chloride ions. reagent(s)Use your reagent(s) to carry out a test on each of FA 4, FA 5 and FA 6 and record your results in the space below. (ii) State which solution(s) contain a chloride ion.[3] [Total: 15]UCLES 2014 9701/33/M/J/14 [Turn over<br />

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