A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5 . At the end point , the volume of same base required is 26.6 mL. The Ka of acid is ? a. 8.219 × 10 -5 b. 8.219 × 10 -7 c. 8.219 × 10 -6 d. 8.219 ×10 -4 Ans ;- ( C ) 8.219 × 10 -6 Please explain in detail......

Question

A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5 . At the end point , the volume of same base required is 26.6 mL. The Ka of acid is ? ​ a. 8.219 × 10 -5 ​ b. 8.219 × 10 -7 c. 8.219 × 10 -6 d. 8.219 ×10 -4 Ans ;- ( C ) 8.219 × 10 -6 Please explain in detail......

Arun · Answer

Dear student

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 $\rightarrow$ BA + H2O

t=0 2.66 12 0 0

t1 1.46 0 1.2 1.2

Therefore for a buffer solution,

$pH = pKa+\log \frac{\left [ salt \right ]}{\left [ acid \right ]}$

$\Rightarrow 5 = pKa+\log \frac{1.2}{1.46}$

$\Rightarrow \log Ka = -5.86$

$\Rightarrow Ka = 8.21 \times 10^{-6}$

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A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5 . At the end point , the volume of same base required is 26.6 mL. The Ka of acid is ? a. 8.219 × 10 -5 b. 8.219 × 10 -7 c. 8.219 × 10 -6 d. 8.219 ×10 -4 Ans ;- ( C ) 8.219 × 10 -6 Please explain in detail......

A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5. At the end point, the volume of same base required is 26.6 mL. The Ka of acid is ?
a. 8.219 × 10^-5
b. 8.219 × 10^-7
c. 8.219 × 10^-6
d. 8.219 ×10 ^-4
Ans ;- (C) 8.219 × 10^-6
Please explain in detail......

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A weak acid HA after treatment with 12 mL of 0.1 M strong base BOH has a pH of 5. At the end point, the volume of same base required is 26.6 mL. The Ka of acid is ?​ a. 8.219 × 10-5​ b. 8.219 × 10-7c. 8.219 × 10-6d. 8.219 ×10 -4Ans ;- (C) 8.219 × 10-6Please explain in detail......