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Nucleophilic Addition at the Carbonyl

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For preparing a buffer of pH 6 by mixing sodium acetate and acetic acid the ratio of the concentration of salt and acid should be ( Ka=10^-5)

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Q. For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (

K_{a}

10^{- 5}

)

Q. Consider an acidic buffer solution of acetic acid and sodium acetate at

25^{o} C

. What should be the ratio of concentration of sodium acetate and acetic acid so that

p H = 4

is obtained ?

Given :

K_{a}

value of acetic acid is

1.8 \times 10^{- 5}

and 10^{(- 0.75)} = 0.18

A buffer solution of pH = 5.15 is to be prepared from acetic acid (Ka =

$1.80x10^5$ ), sodium acetate and water. What must be the molar ratio of acetate ion to acetic acid in this solution to obtain this pH?

p H

of a simple sodium acetate buffer is given by

p H = p K_{a} + log \frac{[S a l t]}{[A c i d]}

K_{a}

= 1.8 \times 10^{- 5}

If [Salt]=[Acid]

= 0.1 M

p H

of the solution would be about:

Q. Consider an acidic buffer solution of acetic acid and sodium acetate at

25^{o} C

. What should be the ratio of concentration of sodium acetate and acetic acid so that

p H = 4

is obtained ?

Given :

K_{a}

value of acetic acid is

1.8 \times 10^{- 5}

and 10^{(- 0.75)} = 0.18

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