# A weak acid after treatment with 12ml of 0.1m strong base BOH has a PH of 5. At the end point, the volume of same base required is 26.6ml Ka of acid is  Option 1) 1.8x10-15 Option 2) 8.12x10-6 Option 3) 1.8x10-6 Option 4) 18.2x10-5

As learnt in

Buffer Solutions -

The solutions which resist change in pH on dilution or with addition of small amounts of acid or alkali are called buffer solution.

- wherein

Many body fluids  e.g.  blood

Total milliequivalents of acid = milliequivalents of base

= 26.6 x 0.1 = 2.66

But the resultant mixture has HA left

The reaction is as follows:

HA    +    BOH  BA    +    H2O

t=0      2.66            12         0              0

t1        1.46             0         1.2           1.2

Therefore for a buffer solution,

Option 1)

1.8x10-15

Option 2)

8.12x10-6

Option 3)

1.8x10-6

Option 4)

18.2x10-5

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