42. Which of the following statements describes a system at equilibrium? Page 11

Question

42. Which of the following statements describes a system at equilibrium? Page 11 of 12 e. the forward rate - the reverse rate of the reaction. both (a) and (c). e. either (a) or (b) depending upon the temperature. 43. Carbon dioxide is reduced to make carbon monoxide according to the following reaction: Which set of conditions produces the highest yield of carbon monoxide? a. High temperatures and high total pressure (small volume). b. High temperatures and low total pressure (large volume). c. Low temperatures and low total pressure (large volume). d. Low temperatures and high total pressure (small volume). 44. For the reaction in the previous question, which of the following will have NO effect on the position of the equilibrium? a. Adding carbon dioxide to the reaction mixture. b. Removing carbon monoxide from the reaction mixture. c. Lowering the temperature Adding carbon to the reaction mixture. 45. An aqueous solution of NH.F will be: a. acidic b. basic c.neutral 46. Which of the following is the weakest acid: HCIO, HClo, HCI a. HCio, b. c. 47. What is the [OH] concentration for an aqueous solution with a pH of 4.502 a. 9.50 b. 3.2x10 c. 4.50 d 3.2x 10-1 48. Write down the formula for the conjugate base of the weak acid HCIO

Explanation / Answer

45. a

When the salt NH4F is dissolved in water, the NH4+ ion acts like an acid and the F- ion acts like a base. Divide 10^-14 (Kw) by 7.2*10^-4 (Ka of HF) to get 1.4*10^-11, the Kb of F-. Since the Kb F- is smaller than the Ka of NH4+, I said the solution was acidic.

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