A Buffer Mixture Of Acetic Acid And Potassium Acetate Has PH=5.24 ...

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Home
Engineering
Solve it, A buffer mixture of acetic acid and potassium acetate has PH=5.24. The ratio of [CH3COO-]/[CH3COOH]in this buffer is, (pKa=4.74)

#Chemistry
#Engineering
#Physical and Chemical Equilibria
#Birla Institute of Technology & Science Admission Test

A buffer mixture of acetic acid and potassium acetate has PH=5.24. The ratio of [CH3COO-]/[CH3COOH] in this buffer is, (pKa=4.74)

Option 1)
3:1

Option 2)
1:3

Option 3)
1:1

Option 4)
1:2

Answers (1)

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

$pH = pKa+\log \frac{\left ( salt \right )}{\left ( acid \right )}$

for a buffer solution of weak acid and it's salt

$\Rightarrow 5.24 = 4.74 +\log \frac{\left [ CH_{3}COO^{-} \right ]}{\left [ CH_{3}COOH \right ]}$

$\Rightarrow \log \frac{\left [ CH_{3}COO^{-} \right ]}{\left [ CH_{3}COOH \right ]} = 0.5$

$\Rightarrow \frac{\left [ CH_{3}COO^{-} \right ]}{\left [ CH_{3}COOH \right ]}\sim 3$

Option 1)

3:1

This option is correct

Option 2)

1:3

This option is incorrect

Option 3)

1:1

This option is incorrect

Option 4)

1:2

This option is incorrect

Posted by

Vakul

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