CIE Nov 2013 v5 Paper 3 Q3

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Examiners For Use 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. (a) You are provided with a solid FA 4. FA 4 is a mixture that contains two cations and two anions. (i) Place a spatula measure of FA 4 in a hard-glass test-tube. Heat the solid and identify the gas given off. Record all your observations.(ii) To a spatula measure of FA 4 in a test-tube, add a 1 cm depth of dilute nitric acid. Record your observations.UCLES 2013 9701/35/O/N/13 [Turn over<br /> Examiners For Use (iii) To a spatula measure of FA 4 in a test-tube, add approximately a 2 cm depth of distilled water to make a solution. Divide the solution into two portions. To therst portion, add a 1 cm depth of aqueous sodium hydroxide. Record your observations.To the second portion, add a few drops of aqueous silver nitrate, then add a 1 cm depth of dilute nitric acid. Record your observations.(iv) Use your results from (i) to (iii) to identify two anions and one cation that are present in FA 4. anions presentandcation present(v) What further test could be carried out on FA 4 to con rm the presence of the cation you suggested in (iv)? You should state the reagent to be used and the expected result. Do not carry out this test.(vi) To a spatula measure of FA 4 in a test-tube, add a 1 cm depth of distilled water to make a solution. To this solution, add a few drops of aqueous barium chloride or barium nitrate. Describe the appearance of the precipitate formed and state its identity. appearance of precipitateidentity of precipitate[9]UCLES 2013 9701/35/O/N/13<br /> Examiners For Use (b) FA 5, FA 6, FA 7 and FA 8 are aqueous solutions each containing one of the ions Al 3+, Ca2+, Zn2+ and Pb2+. (i) Carry out the following tests. Record your observations in the spaces provided in the table. FA 5 FA 6 FA 7 FA 8 observations test To a 1 cm depth of solution in a test-tube, add a few drops of aqueous sodium hydroxide, then add excess aqueous sodium hydroxide. To a 1 cm depth of solution in a test-tube, add a few drops of aqueous ammonia, then add excess aqueous ammonia. To a 1 cm depth of solution in a test-tube, add a 1 cm depth of aqueous potassium iodide. (ii) Use the Qualitative Analysis Notes on page 10 to identify the cation present in each of the solutions. FA 5 is, FA 6 is, FA 7 is, FA 8 isUCLES 2013 9701/35/O/N/13 [6] [Total: 15] [Turn over<br />

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