Higher the amount of acid or base used to produce a definite change of pH in a buffer solution,higher will be its buffer capacity. Buffer capacity of solution is maximum under the following conditions:
[Salt= [Acid] (in acid buffer), [Salt] = [Base] (in base buffer) pH of a buffer solution lies in the range given below: pH = `pk_(a)pm1`,
In other words, any buffer solution can be used as buffer up to two pH units only, depending upon the value of `pK_(a)`, or `pK_(b),`. A buffer is said to be efficient when `pH_(a) =pK_(a)`, or pOH= `pk_(b)`
The bulfer capacity is equal to :

Options

A. `(Deltan)/(DeltapH)`
B. `(pH)/(Deltan)`
C. `pK_(a)=pm1`
D. none of these

Answer

A