Assignment_and_extra_questions__2

Assignment_and_extra_questions__2 - Spring 06 Chem 123...

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Spring 06 Chem 123 Assignment 2 Due: Friday July 7 th at the beginning of class 1. Order the following acids from strongest to weakest. A) HI B) CH 3 OH C) CH 3 CH 2 COOH D) C 6 H 5 OH E) CH 3 CHClCOOH 2. Order the following bases from strongest to weakest. A) (CH 3 ) 3 CO¯ B) HO¯ C) CH 3 NH 2 D) CH 3 NH¯ E) CH 3 CH 2 ¯ 3. In the following cases, you are given equilibrium constants for the two indicated reactions at 25°C, using atm for partial pressures of the gases. Use the data to calculate K p for the third reaction. N 2 (g) + 1 / 2 O 2 (g) N 2 O(g) K p, 1 = 7.1 × 10 19 N 2 (g) + O 2 (g) 2 NO(g) K p, 2 = 4.23 × 10 31 2 N 2 O(g) + O 2 (g) 4 NO(g) K p , 3 = ? 4. For the reaction CO(g) + 2H 2 (g) Æ CH 3 OH(g), Δ H = 90.2 kJ (per mole of CO) and K p = 2.2 × 10 4 at 298 K (when the pressures are expressed in atmospheres). What is K p at 500 K? 5. Trimethylamine, (CH 3 ) 3 N, is a weak base that ionizes in aqueous solution: ( C H 3 ) 3 N(aq) + H 2 O(l) (CH 3 ) 3 NH + (aq) + OH (aq) A 0.120 M solution of (CH 3 ) 3 N(aq) is 2.29% ionized at 25 O C. (a) Calculate [OH ], [(CH 3 ) 3 NH + ], [H 3 O + ] and the pH for a 0.120 M (CH 3 ) 3 N(aq) solution at 25 o C. (b) Calculate K b for (CH 3 ) 3 N at 25 o C. (c) Calculate the degree of ionization, α , of a 0.096 M solution of trimethylamine. Does the degree of ionization increase, decrease, or remain unchanged as the concentration of (CH 3 ) 3
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Assignment_and_extra_questions__2 - Spring 06 Chem 123...

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