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Chapter 11: Q1TY (page 240)

Find the pH when Va = 14.63 mL.

Short Answer

Expert verified

The pH is 4.73

Step by step solution

01

Information given

The following information was obtained from the example to solve this problem

Titration of pyridine using HCl

Amount of pyridine=25.00 mL of 0.08364M pyridine

Concentration of HCl=0.1067 M

Equivalence point occurs at 19.60 mL

pKa =5.20

Kb = 1.59脳10-9

Ka=(Kw/Kb)=6.31脳10-6

02

Reaction

The titration reaction is as follows

In the mixture of pyridine and pyridinium ion, a part of pyridine will be neutralized.

03

Calculation

The fraction of pyridine titrated is (14.63/19.60)=0.746

Therefore, the remaining fraction will be

1-0.746=0.254

The pH will be

pH=pKa+logBBH+=5.20+log0.2540.746=4.73

Therefore, the pH is 4.73

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