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Higher the amount of acid or base used t...

Higher the amount of acid or base used to product a deinite change of pH in a buffer solution, higher will be its buffe capacity. Buffer capcity of solution is maximum under the following conditions
[Salt] = [Acid](in acid buffer)
[Salt] = [Base] (in base capacity]
pH of buffer solution lies inthe range given below `pH = pH_(a) +-1`
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 = pK_(a)` or `pOH = pK_(b)`
Buffer capacity is maximum when

A

One mole of `NH_(4)Cl` is added to two moles of `NH_(4)OH`

B

One mole of `NH_(4)Cl` is added to one moles of `NH_(4)OH`

C

One mole of `NH_(4)Cl` is added to one moles of `NaOH`

D

One mole of `NHCl` is added to one moles of `NaOH`

Text Solution

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The correct Answer is:
B
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Any buffer solution can be used as a buffer upto two pH units only.

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