Problem: Which of the following acids should be used to prepare a buffer with a ph of 4.5?A. HOC6H4OCOOH, Ka = 1.0 x 10-3B. C6H4(COOH)2, Ka = 2.9 x 10-4C. CH3COOH, Ka = 1.8 x 10-5D. C5H5CCOOH, Ka = 4.0 x 10-6E. HBrO, Ka = 2.3 x 10-9

FREE Expert Solution

he maximum buffering capacity of a solution is when the pH of the solution is equal to pKa and the buffer range of a solution is pH = pKa ± 1

 maximum buffering capacity:              pH = pKa
 buffering range:              pH = pKa ± 1


Recall the Henderson-Hasselbalch equation:

pH=pKa+logconjugate baseweak acid


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Problem Details

Which of the following acids should be used to prepare a buffer with a ph of 4.5?

A. HOC6H4OCOOH, Ka = 1.0 x 10-3

B. C6H4(COOH)2, Ka = 2.9 x 10-4

C. CH3COOH, Ka = 1.8 x 10-5

D. C5H5CCOOH, Ka = 4.0 x 10-6

E. HBrO, Ka = 2.3 x 10-9

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