Edexcel Jun 2012 Paper 3 Q1

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Answer ALL the questions. Write your answers in the spaces provided. 1 A student is given aqueous solutions of: x sodium chloride, NaCl(aq) x potassium iodide, KI(aq) x dilute hydrochloric acid, HCl(aq) x dilute nitric acid, HNO3(aq) The solutions are labelled A, B, C and D, but not necessarily in the order listed above. The student carried out two tests on each solution. Test 1 1. The student put a 1 cm depth of each of the solutions A, B, C and D into separate test tubes. 2. The student added one spatula measure of solid sodium carbonate, Na2CO3, to each test tube. 3. The students observations were recorded as shown in Table 1 below, in the column labelled Test 1. Test 2 1. The student put a 1 cm depth of each of the solutions A, B, C and D into separate test tubes. 2. The student added an equal volume of aqueous silver nitrate solution, AgNO3, to each test tube. 3. The students observations were recorded as shown in Table 1 below, in the column labelled Test 2. Table 1 Observations Solution A B C D Test 1 Effervescence No reaction No reaction Effervescence Test 2 No reaction Yellow precipitate White precipitate White precipitate *P39310A0216*<br /> (a) Use the results of the tests to identify each of the four solutions using the letters A, B, C and D in Table 2. Table 2 Name of solution Letter Sodium chloride solution Potassium iodide solution Dilute hydrochloric acid Dilute nitric acid (b) Explain how the observations allowed the student to distinguish between dilute hydrochloric acid and sodium chloride solution. (3) (1)(c) Give the ionic equation, including state symbols, for the reaction of solution B in Test 2. (d) What would you expect to see when dilute ammonia solution is added to the white precipitate formed by solution C in Test 2? (2) (1)(Total for Question 1 = 7 marks) *P39310A0316* Turn over<br />

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