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Q.

The pH of a buffer solution changes from 6.20 to 6.17 when 0.003 mole of acid is added to 500 mL of the buffer. The buffer capacity of the system is, therefore,

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a

0.1

b

0.3

c

0.2

d

0.4

answer is C.

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Detailed Solution

(3) Buffer capacity
= No of moles of acid added per litre of buffer/Change in pH .
= 0.006/ 0.03 = 0.2

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