AP QUIZZES - AP TOPIC 14 Acids & Bases SET B
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QUESTION 1. When making a buffer of pH = 5, acids with the following Ka values are available. Which would be the best acid to use?

(A) 1.8 x 10-5
(B) 2.8 x 10-5
(C) 1.8 x 10-8
(D) 4.9 x 10-10
(E) 3.0 x 10-8

QUESTION 2. For a buffer with a pH = 4.87 that contains a weak acid with an equilibrium constant Ka = 3.31 x 10-5, what is the ratio of [salt]:[acid]?

(A) 2.45
(B) 1.00
(C) 0.41
(D) 4.87
(E) 3.12

QUESTION 3. A buffer with a pH value = 5.92 that contains a weak acid with a pKa of 5.12 is diluted ten-fold. What is the new pH of the buffer solution?

(A) 5.92
(B) 5.62
(C) 5.02
(D) 5.32
(E) Cannot tell from the data

QUESTION 4. Consider a buffer solution made from ammonia and ammonium chloride. Which of the following statements is FALSE?

(A) The pH of the buffer will be above 7
(B) The ammonia acts acts as a base by absorbing acid
(C) The ammonium ion acts as an acid
(D) Increasing the concentration of both the ammonia and the ammonium ions will NOT affect the buffer's capacity
(E) The buffer will not resist change in pH if a large amount of acid or base is added

QUESTION 5. All of the following experimental procedures will produce buffers, except one. Which procedure fails to yield a buffer solution?

(A) Mixing solutions ammonia and ammonium bromide
(B) Mixing solutions of propanoic acid and potassium propanoate
(C) Mixing solutions of nitric acid and potassium nitrate
(D) Mixing solutions of butanoic acid and sodium butanoate
(E) Partially reacting a weak acid with a strong base, ensuring that some of the weak acid remains in excess




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