d. [HA] ko 12. The most effective buffering system a. The pKa value of acid is h

Question

d. [HA] ko 12. The most effective buffering system a. The pKa value of acid is higher than the buffer pH. b. Contains equal concentration of acid and conjugate base c. The ratio of base/acid may vary d. A and B e. A and C 13. Which of following solutions is an appropriate environment for measurement of biological activities a. Weak acidic solution b. Purified water c. Buffer solution d. Neutral solution 14. Before measuring the pH of a solution a. Adjust the temperature of the meter with the room temperature b. Calibrate the electrode using standard buffers c. Warm up your solution to the room temperature d. A and B e. Band C 15. In a pH meter, the glass bulb at the bottom of sensing electrode a. Allows hydrogen ion pass through the glass b. Is made from a special glass, coated both sides with a layer of hydrated gel c. Allows the metal cation (Na) pass through the glass d. A and B e.B and C

Explanation / Answer

12) B. Contains equal concentrations of both acids and conjugate base.

13) a. Buffer solution

14) b. Calibrate the electrode using the standard buffers.

15) a. Allows hydrogen ion to pass through the glass.

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