What effect would the following errors have on the calculated value of Ka? Choos
ID: 954817 • Letter: W
Question
What effect would the following errors have on the calculated value of Ka? Choose whether the calculated value would be too high, too low, or if there is no effect. Explain your Answer.
a. The pH meter was improperly calibrated, so that the pH readings on the instrument were 0.3 pH units too low.
A. pKa would be too low and Ka would be too high
B. pKa would be too high and Ka would be too low
C. neither would change
D. none of these
b. An endpoint/equivalence point was erroneously read as 27.20 mL whereas the reading was actually 26.80 mL.
A. pKa would be too low and Ka would be too high
B. pKa would be too high and Ka would be too low
C. neither would change
D. none of these
c. In Step 2, instead of adding 75 mL of water, 150 mL of water was added.
A. pKa would be too low and Ka would be too high
B. pKa would be too high and Ka would be too low
C. neither would change
D. none of these Explanation:
Explanation / Answer
(a) A. pKa would be too low and Ka would be too high
(b) B. pKa would be too high and Ka would be too low
(c) pKa would be too low and Ka would be too high
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