Chemistry Practice Problems Equivalence Point Practice Problems Solution: What is the pH at the half-equivalence point in th...

Solution: 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 8.75.

Problem

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 8.75.

Solution

We are asked to calculate the pH at the half equivalence point


We can use the Henderson Hasslebalch equation to calculate the pOH of a titrated base: 

pOH = pKb + log(BH+B)


We then can use the equation  below to calculate the pH:

pH= 14- pOH


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