d. Acetate (pka: 4. 9. In a solution with high pH value, the sodium error ma a.
ID: 194885 • Letter: D
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d. Acetate (pka: 4. 9. In a solution with high pH value, the sodium error ma a. Increase the measured pH value b. Decrease the measured pH value c. Does not affect the pH measurement 10. When you dilute the concentrated buffers to desired concentra ration, the pH vaue C. Increased d. All of the above might happen based on the original pH of buffer 11. When the temperature of a buffer solution increases The pH of buffer will increase a. b. The pH of buffer will decrease c. Has no effect on buffer pH d. [HA 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. B and C 5. 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 CExplanation / Answer
9)sodium error, it happens at higher alkaline pH where the Na+concentration is very higher than the H+ concentration.at this higher Na+concentration the pH meter will respond to the Na+ concentration instead of H+ and gives a very low pH. Ans:b
10)(a) dilution of a buffer does not reults in change in pH beacuse ph=-log[H+], here on diluting the buffer results in dissociation of its acid at the same time its conjugate base present in the buffer gets associated.
11)(b)pH is defined as the -log of free H+ concentration. When temperature increses the bonds holding the H+ will break and more H+ will get free. So pH decreases.
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