Edexcel Jan 2013 Paper 6 Q1

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Answer ALL the questions. Write your answers in the spaces provided. 1 The table shows a series of tests carried out on a soluble crystalline compound A, which contains one anion and one cation. For each test, complete the table by filling in the inference column. (a) (b) (c) (d) (e) (f) Test Observe the appearance of A. Measure the pH of a dilute aqueous solution of A using a pH meter. Observation Pale green solid. The pH is 6.0. Add a few drops of dilute sodium hydroxide solution to a solution of A. A green precipitate forms. Leave a sample of the green precipitate formed in (c) to stand in air. The green precipitate turns brown on the surface. Add excess sodium hydroxide solution to a sample of the green precipitate formed in (c). Add barium chloride solution, BaCl2(aq), acidified with hydrochloric acid, to a solution of A. The green precipitate does not dissolve. A white precipitate forms. InferenceThe type of reaction that has occurred when A dissolved in water isThe sodium hydroxide is acting asThe formula of the green precipitate isThe type of reaction that has occurred isThe formula of the brown precipitate isThe white precipitate is(1) (1) (2) (2) (1) (1) (g) Identify compound A by name or formula. (1)(Total for Question 1 = 9 marks) *P41217A0316* Turn over<br />

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