3. Which of the following acids below is best for the preparation of a buffer wi

Question

3. Which of the following acids below is best for the preparation of a buffer with a pH of 4.00? (a) H,so, (ka-1.7x10-2) (b) HF (Ka-6.9 x10-4) (c) HC,Hso, (Ka-6.6 x 10-5) d) H,PO (K-6.2x 10- (e) NHt (Ka 5.6x10-10) 4. If the acid to base ratio in a buffer increases by a factor of 10, the pH of the buffer (a) decreases by 10. (b) decreases by 1. (c) increases by 1. (d) increases by 10. (e) is not affected. 5. The buffer capacity is (a) the amount of Ht or OH that can be absorbed by a buffer without changing the pH appre- ciably (b) the amount of buffer requred to neutralize a strong acid or base. (c) a measure of the volume of buffer a container may hold. (d) the volume of buffer required to neutralize 1.00 L of 1.00 M HCL. (e) dependent only on the ratio of base to acid in the buffer. Page 2 of 8

Explanation / Answer

3. C

4. E

5. A

Buffer capacity quantifies the ability of a solution to resist changes in pH by either absorbing or desorbing H+ and OH- ions.

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