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Q.

PH of an acidic buffer  is 5.8. pka of weakacid is 4.8. 100 ml of 1M BA(salt) is mixed with ‘V’ ml of 0.1 M weakacid (HA). Value of ‘V’ is

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a

10 ml

b

1 ml

c

100 ml

d

1000 ml

answer is C.

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Detailed Solution

pH = pka+logVsNsVaNa5.8 = 4.8 + log 100(1)V(0.1)log 10 = log 1000.1 V10 = 1000.1 VV = 100 ml
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