If the pH at the half equivalence point is 4.2, what is the pKa of the...
If the pH at the half equivalence point is 4.2, what is the pKa of the acid? Half equivalence point is also called the midpoint in the text.
Homework Answers
At half equivalence point, concentration of acid is equal to concentration of conjugate base
So,
[A-] = [HA]
Using:
pH = pKa + log [A-]/[HA]
4.2 = pKa + log (1)
4.2 = pKa + 0
pKa = 4.2
Answer: 4.2
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equivalence point, where half of the analyze has reacted to form
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If 0.4400.440 moles of a monoprotic weak acid
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