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Standard XII

Chemistry

Arrhenius Acid

Which of the ...

Question

Which of the following is correct regarding buffer solution?

It contains weak acid and its conjugate base.

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It shows low change in pH on adding small amount of acid or base.

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(A) and (B) both

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None of these

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Solution

The correct option is C (A) and (B) both
A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small or moderate amount of strong acid or base is added to it and thus it is used to prevent changes in the pH of a solution. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.

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Similar questions

A buffer is a solution of weak acid and its conjugate base or a weak base and its conjugate acid. It resists the change in

p H

, when small amount of strong acid or base is added to it. Buffer solutions have wide applications.

H C l

gas is passed through an aqueous solution of 0.1M 1-aminopropane

(P r N H_{2})

till the

p H

reaches 9.71. Calculate the ratio of

[P r N H_{2}] / [P r N H_{3}^{+}]

in this solution.

[K_{a} (P r N H_{3}^{+}) = 1.96 \times 10^{- 11}

Q. Choose the correct combination among thefollowing
A) A mixture of weak acid and its salt of strong base acts as acidic buffer.
B) As number of moles of acid or base required to change the

p^{H}

of the buffer by one unit increases, the quality of buffer increases.
C) Buffer action is maximum at

p^{H} = P^{K a}

in case of acidic buffer.

A buffer is a solution of weak acid and its conjugate base or a weak base and its conjugate acid. It resists the change in

p H

, when small amount of strong acid or base is added to it. Buffer solutions have wide applications.

20.0 m L

0.10 M

of 1-aminopropane is titrated with

0.10 M

H C l

. The

p H

at the equivalence point is

p ≃ 6

and the appropriate acid-base indicator. is Methyl red. (4.2-6.2) wright the right answer

Table 1.
Table 1: List of acid/base indicators

Common name	Transition range, $p H$	Color change
Methyl orange	3.2 - 4.4	red-orange
Methyl red	4.2 - 6.2	red-yellow
Phenol red	6.8 - 8.2	yellow-red
Phenolphthalein	8.0 - 9.8	colorless-red
Thymolphthalein	9.3 - 10.5	colorless-blue

Assertion: A buffer has a definite pH value which changes, on keeping it or on diluting it.

Reason: A buffer solution is a mixture consisting of a weak acid and its conjugate base or vice versa.

A physician wishes to prepare a buffer solution at pH = 4.41 that efficiently resist change in pH yet contains only small concentration of the buffering agents. Which one of the following weak acid together with its sodium salt should be best to use?

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