Edexcel Jun 2015 (IAL) Paper 6 Q1

Answers available below

Answer ALL the questions. Write your answers in the spaces provided. 1 A white solid, A, contains one cation and one anion. When water is added slowly, the solid turns blue and then dissolves to form a blue solution, B. (a) When aqueous barium chloride is added to an acidified portion of solution B, a white precipitate forms. (i) Give the formula of the anion in B. (1)(ii) Name a suitable acid for acidifying solution B in this test. (1)(b) When aqueous ammonia is added to another portion of solution B, a blue precipitate forms. When more aqueous ammonia is added, this precipitate dissolves to form a deep blue solution, C. (i) Identify, by name or formula, the blue precipitate. (1)(ii) Give the formula of the ion responsible for the deep blue colour of solution C. (1)(c) Give the formula of the complex ion which gives the blue colour to solution B. Include the ligands in your answer. (1)(d) Give the formula of the white solid A. (1)(e) Why is solid A white and not coloured blue? Justify your answer. (2)(Total for Question 1 = 8 marks) *P44884A0216*<br />

Show answer