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Basic Buffer Action

Addition of 0...

Question

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 $p H$ ?

A

H C l

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B

C H_{3} C O O H

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C

C H_{3} C O O N a

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D

N a O H

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Solution

The correct option is C $N a O H$
When NaOH is added to a mixture of $C H_{3} C O O H$ and $C H_{3} C O O N a$ , NaOH reacts with $C H_{3} C O O H$ to form $C H_{3} C O O N a$ .

Thus the concentration of $C H_{3} C O O H$ decreases and the concentration of $C H_{3} C O O N a$ increases.

Thus the hydrogen ion concentration decreases and pH of the solution increases.

Option D is correct.

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Similar questions

Q. A solution consists of

1

C H_{3} C O O H

C H_{3} C O O N a

p K a

of acetic acid is

4.8

p H

of the solution, when

0.1

N a O H

Q. Calculate the ratio of pH of a solution containing

1

{C H}_{3} C O O N a + 1

H C l

per litre and of the other solution containing

1

{C H}_{3} C O O N a + 1

{C H}_{3} C O O H

C H_{3} C O O H

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]

Q. The ratio of volumes of

C H_{3} C O O H

(0.1 N)

C H_{3} C O O N a

(0.1 N)

required to prepare a buffer solution of

p H

p K_{a}

C H_{3} C O O H

Q. Assertion: The pH of an aqueous solution of

C H_{3} C O O H

remains unchanged on the addition of

C H_{3} C O O N a

.
Reason: The ionisation of

C H_{3} C O O H

is supressed by the addition of

C H_{3} C O O N a

.

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