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krek1111 [17]
3 years ago
7

What is the pH at the half-equivalence point in the titration of a weak base with a strong acid? The pKb of the weak base is 7.9

5. What is the pH at the half-equivalence point in the titration of a weak base with a strong acid? The of the weak base is 7.95. 8.75 6.05 7.95 5.25
Chemistry
1 answer:
ValentinkaMS [17]3 years ago
5 0

Hey there!

Given the reaction:

B + H⁺   => HB⁺


At half-equivalence point :  [B] = [HB⁺]

=> [B] / [HB⁺] = 1

Henderson-Hasselbalch equation :


pH = pKa + log ( [B] ) / ( HB⁺)]

pH = 14 - pKb + log ( 1 )

pH = 14 -  7.95 + 0

pH = 6.05


Answer C


Hope that helps!



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