CIE Nov 2016 v3 Paper 3 Q3

Answers available below

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. (a) FA 7, FA 8, FA 9 and FA 10 are solutions that each contain a metal cation from those listed in the Qualitative Analysis Notes on page 10. Carry out tests using reagents that will allow you to identify which metal ions are present. Draw a single table to record your observations. Complete the table below with your conclusions. solution metal ion present FA 7 FA 8 FA 9 FA 10UCLES 2016 9701/33/O/N/16 [11] [Turn over<br /> (b) Carry out the following test and record your observations. test observations To a 1 cm depth of FA 10 in a boiling tube add a 0.5 cm depth of 20 vol hydrogen peroxide, then add one drop of aqueous sodium hydroxide. PMT [2] (c) FA 11 is a solid that contains one anion from those listed in the Qualitative Analysis Notes on page 11. Place all of FA 11 into a boiling tube and add a 3 cm depth of distilled water. Stir until all the solid has dissolved. (i) Carry out the following test and record your observations. test observations To a 1 cm depth of the solution of FA 11 in a test-tube add dilute sulfuric acid. (ii) Use your observations from (i) to identify the anion in FA 11. The anion is. (iii) Use the remaining solution of FA 11 in the boiling tube to carry out a further test to support your identification of the anion. Record details of this test.UCLES 2016 9701/33/O/N/16 [4] [Total: 17]<br />

Show answer