Which statements regarding the Henderson-Hasselbalch equation are true? 1) If th
ID: 1022479 • Letter: W
Question
Which statements regarding the Henderson-Hasselbalch equation are true? 1) If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined. 2) At pH = pK a for an acid, there is an equal amount of conjugate base to acid in solution. 3) At pH >> pK a for an acid, the acid will be mostly ionized. 4) At pH << pK a for an acid, the acid will be mostly ionized.
1, 2, and 4 are true.
2, 3, and 4 are true.
1, 2, and 3 are true.
All of the listed statements are true.
Explanation / Answer
Henderson-Hasselbach equation:
pH = pKa + log [base]/[acid]
1) as per the equation, if pH and pKa are known the ratio, [base]/[acid] can be calculated
2) When pH = pKa
log[base]/[acid] = 0, therefore base/acid = 1 and hence [base] = [acid]
3) when pH >> pKa, [base] >> [acid] which implies that the acid will bemostly ionized
Hence 1, 2 and 3 are true.
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