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Basic Buffer Action

pKa of NH4+...

Question

$p K_{a}$ of $N H_{4}^{+}$ is $9.26$ . Hence, effective range for $N H_{4} O H - N H_{4} C l$ buffer is about $p H$ :

8.26 t o 10.26

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4.74 t o 5.74

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3.74 t o 5.74

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8.26 t o 9.26

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Solution

The correct option is B $8.26 t o 10.26$
As we know,
$p H = p K_{a} + l o g \frac{s a l t}{a c i d}$
And buffer range is $p K_{a} \pm 1$ so it will work between 8.26 to 10.26.

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50 m L

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= 8.26

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