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Buffer Solutions

Which of the ...

Question

Which of the following solutions can act as buffer?

0.1

molar aq.

N a C l

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0.1

molar aq.

C H_{3} C O O H + 0.1

molar

N a O H

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0.1

molar aq. ammonium acetate

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0.1

molar

H_{3} P O_{4}

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Solution

The correct option is C $0.1$ molar aq. ammonium acetate
Weak acid and salts of a weak acid and weak base and salt of weak base can act as a buffer in the aqueous medium.

0.1 molar aq. ammonium acetate solution is salt of weak base ammonium hydroxide and weak base is ammonium hydroxide.
Thus it forms a buffer solution.

Whereas 0.1 molar aq. NaCl is a salt of strong acid HCl and strong base NaOH, 0.1 molar aq. acetic acid and 0.1 molar NaOH contain strong base NaOH completely neutralised the weak acid. Thus it does not form buffer solution.

And 0.1 molar $H_{3} P O_{4}$ is a strong acid thus it also does not form buffer solution.

Option C is correct.

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