test2 - Chemistry 2000 Spring 2006 Test 2 Time: 50 minutes...

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Chemistry 2000 Spring 2006 Test 2 Time: 50 minutes Total marks: 49 Aids allowed: Calculator Instructions: Answer all questions in the booklets provided. You can answer the questions in any order, but make sure that your answers are clearly marked with the question number. Useful data c = 1mol / L P = 1bar At 25 C, K w = 10 - 14 . 1. Suppose that you are titrating a solution of the weak base methylamine (CH 3 NH 2 ) with hydrochloric acid. The pK b of methylamine is 3.38. Would you expect the p H at the equiv- alence point to be above or below 7? Explain briefly. [3 marks] Bonus: Draw a Lewis diagram of methylamine. Explain why it can act as a Lewis base. 2. For the reaction N 2 O 4 ( g ) * ) 2NO 2 ( g ) , K = 0 . 660 at 319 K. Some NO 2 and N 2 O 4 are introduced into a sealed container at the following pressures: P NO 2 = 0 . 4bar and P N 2 O 4 = 0 . 5bar. Is the reaction in equilibrium? If not, in what direction will the reaction proceed? [4 marks] 3. The K sp of nickel (II) hydroxide is 6
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test2 - Chemistry 2000 Spring 2006 Test 2 Time: 50 minutes...

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