CIE Jun 2015 v2 Paper 3 Q3

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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) FB 6 is a solution containing two cations and one anion. Both of the cations are listed in the Qualitative Analysis Notes on page 10. (i) Select reagents to identify the cations in FB 6. Do tests using these reagents and record your results in the space below. The cations in FB 6 areand.UCLES 2015 9701/32/M/J/15<br /> (ii) The anion in FB 6 is the nitrate ion, NO3 presence of the nitrate ion in FB 6 using the method outlined in the Qualitative Analysis Notes on page 11. . Explain why it is dif cult to con rm the[6] Before starting part (b), halfll a 250 cm3 beaker with water and heat with a Bunsen burner to approximately 60 C. You will use this as a hot water bath. Turn off the Bunsen burner. (b) FB 7 is a halogenoalkane. Do the following test to determine the halogen present in FB 7. test observations (i) To a 1 cm depth of ethanol in a test-tube, add a 1 cm depth of silver nitrate followed by 10 drops of FB 7, then place the test-tube in the hot water bath. The halogen present in FB 7 is. (ii) What type of reaction has the halogenoalkane undergone?[4]UCLES 2015 9701/32/M/J/15 [Turn over<br /> (c) FB 8 and FB 9 each contain a single cation and a single anion. Do the following tests and record your observations. test observations (i) To a 1 cm depth of FB 8 in a test-tube, add FB 9 until there is no further reaction, then add aqueous barium chloride or aqueous barium nitrate. (ii) Suggest possible identities for the ions present. You will only be able to identify one of the cations. cationanions[5] [Total: 15]UCLES 2015 9701/32/M/J/15<br />

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