Q.

The pH of a buffer is 6.745. When 0.01 moles of NaOH is added to 1 litre of it, the pH changes to 6.832. Its buffer capacity is

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a

0.187

b

0.115

c

0.076

d

0.896

answer is B.

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Detailed Solution

Buffer capacity=No.  of moles of base added/litre of bufferChange in pH=0.016.832 - 6.745 = 0.010.087 = 0.115
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The pH of a buffer is 6.745. When 0.01 moles of NaOH is added to 1 litre of it, the pH changes to 6.832. Its buffer capacity is