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Standard XII

Chemistry

Electrolytes

pH of CH 3C...

Question

pH of $C H_{3} C O O H$ and $C H_{3} C O O N a$ buffer is 4.8. In which of the following conc. conditions, the buffer capacity will be maximum?

$[C H_{3} C O O H]$ & $[C H_{3} C O O N a]$

0.1 M,0.2 M

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0.2M,0.1 M

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0.34 M,0.34 M

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0.34 M, 0.3 M

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Solution

The correct option is C 0.34 M,0.34 M
$p H = p K a + l o g \frac{[S a l t]}{[A c i d]}$

For maximum buffer capacity, $p H = p K a$

i.e. . $[S a l t] = [A c i d]$

Here, only in option C Concentration of salt and acid is equal.

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Similar questions

Q. The pH of buffer solution prepared by mixing 50 ml of 0.2 M

C H_{3} C O O H

and 25 ml of

C H_{3} C O O N a

is 4.8 what is the concentration of

C H_{3} C O O N a

P_{k a}

C H_{3} C O O H

=4.8

Q. Calculate the

p H

of buffer solution prepared by mixing

50

ml of

0.1

M sodium acetate and

25

ml of

0.2

C H_{3} C O O H

p K_{a}

C H_{3} C O O H

4.8

Q. What will be the new

p H

0.01 m o l

N a O H

is added to a

1 L

buffer solution that is

0.1 M

in acetic acid

(C H_{3} C O O H)

and

0.1 M

in sodium acetate

(C H_{3} C O O N a)

?
Dissociation constant

K_{a}

of acetic acid at

25^{\circ} C

1.8 \times 10^{- 5}

Q. Assertion: On mixing equal volumes of 1 M

H C l

and of 2 M

C H_{3} C O O N a

, an acidic buffer solution is formed.
Reason: The resultant mixture contains

C H_{3} C O O H

and

C H_{3} C O O N a

which are parts of acidic buffer.

Q. Addition of 0.1 mole of which of the following to a buffer solution consisting of 1 mole each of

C H_{3} C O O H

C H_{3} C O O N a

causes greater increase in

p H

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pH of CH3COOH and CH3COONa buffer is 4.8. In which of the following conc. conditions, the buffer capacity will be maximum?[CH3COOH] & [CH3COONa]

The correct option is C 0.34 M,0.34 MpH=pKa+log[Salt][Acid]For maximum buffer capacity, pH=pKai.e. .[Salt]=[Acid]Here, only in option C Concentration of salt and acid is equal.

pH of $C H_{3} C O O H$ and $C H_{3} C O O N a$ buffer is 4.8. In which of the following conc. conditions, the buffer capacity will be maximum?

$[C H_{3} C O O H]$ & $[C H_{3} C O O N a]$

The correct option is C 0.34 M,0.34 M
$p H = p K a + l o g \frac{[S a l t]}{[A c i d]}$

For maximum buffer capacity, $p H = p K a$

i.e. . $[S a l t] = [A c i d]$

Here, only in option C Concentration of salt and acid is equal.