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A buffer solution is one which has...

A buffer solution is one which has

A

reserved acid

B

reserved base

C

reserved acid and reserved base

D

pH equal to 7

Text Solution

Verified by Experts

The correct Answer is:
C
A buffer is a solution characterized by the ability to resist changes in pH when limited amounts of acid or base are added to it. If `0.01` mol of hydrochloric acid is added to 1 L of pure water, the pH decreases form `7.0` to `2.0-a` pH change of `5.0` units. By contrats, the addition of this amount of hydrolichloric acid to 1 L of buffered solution might change the pH only `0.1` unit. A buffer solution resists changes in pH through its ability to combine with both `H^(+)` and `OH^(-)` ions. The reseverd base of buffer neutralizes the added `H^(+)` ions while the reserved acid of buffer neutralizes the added `OH^(-)` ions.
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Buffer Solutions

Buffer Solutions

Buffer capacity of acid buffer solution is more when

The pK_(a) of a weak acid (HA) is 4.5 . The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is:

For a buffer solution which of the following is true ?

Knowledge Check

  • Buffer capacity of acid buffer solution is more when

    A
    `P^(Ka) = P^(H)`
    B
    `["Salt"] = ["Acid"]`
    C
    `P^(Ka) = 7`
    D
    `[H^(+)] = P^(Ka)`

  • The pK_(a) of a weak acid (HA) is 4.5. The pOH of an aqueous buffer solution of HA in which 50% of the acid is ionized is

    A
    `7.0`
    B
    4.5
    C
    2.5
    D
    9.5

  • The pK_a of a weak acid (HA) is 4.5. The poH of an aqueous buffer solution of HA in which 50% of the acid is ionized is

    A
    7
    B
    4.5
    C
    2.5
    D
    9.5