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The pK(a) of a certain weak acid is 4.0....

The `pK_(a)` of a certain weak acid is 4.0. What should be the [salt] to [acid] ratio, if we have to prepare a buffer with a pH= 5 using the acid and one of its salts?

A

`4:5`

B

`5:4`

C

`10:1`

D

`1:10`

Text Solution

Verified by Experts

The correct Answer is:
C
`pK_(a) = 4.0`
pH= 5
`pH = pK_(a)+"log"[Sal t]/[Acid]`
5 = 4+ "log"[Sal t]/[Acid]
`implies "log"[Sal t]/[Acid] = 5-4 = 1`
`[Sal t]/[Acid] = anti"log" of 1.0 = 10`
`[Sal t]/[Acid] = 10:1`
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