CIE Jun 2016 v2 Paper 3 Q3

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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. 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.UCLES 2016 9701/32/M/J/16 [Turn over<br /> (a) (i) FB 5 is a solid element and FB 6 is a solid compound containing one cation and one anion. Carry out the following tests and record your observations. test observations PMT Place a small spatula measure of FB 5 in a boiling tube, add a 1 cm depth of dilute hydrochloric acid and warm the contents of the tube gently. Place small spatula measures of FB 5 and FB 6 in a single boiling tube. Use a test-tube holder to hold the tube. Add a 2 cm depth of aqueous sodium hydroxide. CARE Place a spatula measure of FB 6 in a test-tube. Add a 3 cm depth of distilled water to form a solution for the following two tests. To a 1 cm depth of aqueous FB 6 in a test-tube add a 1 cm depth of dilute hydrochloric acid. To a 1 cm depth of aqueous FB 6 in a test-tube add aqueous sodium hydroxide. (ii) Suggest the identities of FB 5 and FB 6 from your observations. Refer to the relevant observations in your answers. FB 5:reason(s)FB 6: cationreason(s)anionreason(s)[9]UCLES 2016 9701/32/M/J/16<br /> PMT (b) (i) FB 7 and FB 8 are solutions which contain different anions. These may be carbonate, halide, sulfate or sulfite. You are to devise tests to identify the two anions present. Record in a suitable table below:the reagent(s) you use for each test, the observations you make on carrying out the test, the conclusion you make from the result of the test. (ii) The cation in either FB 7 or FB 8 is a transition metal ion. Carry out the following test to identify this cation and record your observations. test To a 1 cm depth of solution in a test-tube add aqueous sodium hydroxide. observations FB 7 FB 8 FBcontains the transition metal ion.UCLES 2016 9701/32/M/J/16 [9] [Total: 18] [Turn over<br />

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