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Salt of Weak Acid and Strong Base

Which of the ...

Question

Which of the following solution(s) $p H$ is not affected markedly by the dilution ?

A

0.01

M

C H_{3} C O O N a

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B

0.01

M

N a H C O_{3}

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C

Buffer of

0.01 M

C H_{3} C O O N a

and

0.01 M

C H_{3} C O O H

.

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D

0.01 M

C H_{3} C O O N H_{4}

.

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Solution

The correct options are
C $0.01 M$ $C H_{3} C O O N H_{4}$ .
D Buffer of $0.01 M$ $C H_{3} C O O N a$ and $0.01 M$ $C H_{3} C O O H$ .
The pH of salts of (weak-acid, strong base) and (strong acid, weak base) depends on the concentration of the salt. (options A and B)
The pH of buffers and salts of (weak-acid, weak base) do not change with dilution. (options C and D)

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Similar questions

p H

of a buffer solution having

0.001 M

N H_{4} O H

0.01 M

N H_{4} C l

K_{b}

0.01

p K_{a}

C H_{3} C O O H

is 4.74. The pH of 0.01 M

C H_{3} C O O N a

100

0.01

C H_{3} C O O H

200

0.02

C H_{3} C O O N a

are mixed to form a buffer solution.

700

mL of water is added to this solution. The pH before and after dilution are:
(pKa = 4.74, log 4 =0.6)

500

0.01 M

{C H}_{3} C O O H + 500

0.02 M

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

p H

5.3010

p K_{b}

{C H}_{3} C O O^{-}

Q. A buffer solution of

p H = 5.74

is to be prepared using

C H_{3} C O O H

C H_{3} C O O N a

. Find the concentration of sodium acetate to be added to

0.01 M

C H_{3} C O O H

K_{a} (C H_{3} C O O H) = 1.8 \times 10^{- 5}

l o g (1.8) = 0.26

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Salt of Weak Acid and Strong Base

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