TS EAMCET 4-Aug-2021 Shift 1 Question Paper

There is no such rule that you need equal concentrations of base and salt of conjugate acid to make a buffer.
A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it.
e.g.

NaOH

Base

⟶Na++

OH⊖

Conjugate‌acid

pOH‌‌=−log[OH−] . . . (i)
pH+pOH‌‌=14
We know that,
pKb=−log[Kb]. . . (ii)
Comparing Eq. (i) and (ii), we get
[pOH=pKb]
So, pOH of the buffer solution is same as p Kb of acid.