pH = 2.96, for the given situation.
C5H5N + HBr --------------> C5H5N+ + Br-
millimoles of pyridine = 80 x 0.3184 =25.472mM
25.472 millimoles of HBr must be added to reach equivalence point.
25.472 = V x 0.5397
V =25.472/0.5397= 47.197 mL HBr
total volume = 80 + 47.197= 127.196 mL
Concentration of [C5H5N+] = no of moles / volume=
25.472/ 127.196= 0.20M
so,
pOH = 1/2 [pKw + pKa + log C]
pKb = 8.77
pOH = 1/2 [14 + 8.77 + log 0.20]
pOH = 11.0355
pH = 14 - 11.0355
pH = 2.96
A substance's pH level indicates how basic or acidic it is. pH ranges from 0 to 14. The material is considered basic if its pH is higher than 7. The term "acidic" refers to a material with a pH below 7. The material is considered neutral when the pH value is exactly 7.
Anything that is capable of releasing a proton qualifies as acidic. A proton will accept a basic material. Visit this article to learn more about acids and bases.
The pH equation is:
([H+]) = -log pH
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