CIE Nov 2017 v3 Paper 3 Q3

Answers available below

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 reagents are selected for use in a test, the name or correct formula of the element or compound must be given. 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. FA 6 and FA 7 are both salts which contain cations and anions from those listed in the Qualitative Analysis Notes. Each salt contains a single cation and a single anion. (a) Carry out the following test and record your observations. observations FA 6 FA 7 test (i) Place a small spatula measure of the solid in a hard-glass test-tube and heat gently at first, then more strongly. (ii) From your observations, what is present in both salts?[4]UCLES 2017 9701/33/O/N/17<br /> (b) Prepare solutions of FA 6 and FA 7 by placing the rest of each solid into separate 100 cm3 beakers. Add approximately 30 cm3 of distilled water to each beaker and stir until fully dissolved. Use these solutions for tests in (b). (i) Carry out tests to determine the cation present in each solution. Record your tests and results in the space below. PMT (ii) Carry out all the following tests and record your observations. test observations solution of FA 6 solution of FA 7 To a 1 cm depth of solution in a test-tube add a 1 cm depth of barium chloride or barium nitrate, then add an excess of hydrochloric acid or nitric acid. To a 1 cm depth of solution in a test-tube add a 1 cm depth of silver nitrate. (iii) Identify the ions present in each salt. FA 6 containsand. FA 7 containsand. [9]UCLES 2017 9701/33/O/N/17 [Total: 13] [Turn over<br />

Show answer