A buffer solution is one which has...

A buffer solution is one which has

reserved acid

reserved base

reserved acid and reserved base

pH equal to 7

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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 capacity of acid buffer solution is more when

`P^(Ka) = P^(H)`

`["Salt"] = ["Acid"]`

`P^(Ka) = 7`

`[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

`7.0`

4.5

2.5

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

4.5

2.5

9.5