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)`
Which among the following solution will be the most efficient buffer?

Options

A. 0.1M `CH_(3)COONa` + 0.0IM `CH_(3)COOH`
B. 0.1M `NH_(4)CI`+ 0.1 M `NH_(4) OH`
C. 0.0001M `HCOOH`+0.002M `HCOONa`
D. All of the above

Answer

B