The pK(a) of a weak acid is 4,8. What sh...

The `pK_(a)` of a weak acid is 4,8. What should be the ratio `[Acid]/[Sal t]` if a buffer of pH= 5.8 is required?

0.1

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The correct Answer is:

pH = 5.8, pka = 4.8 (Given)
`pH = pKa + "log"[Sal t]/[Acid]`
`5.8 = 4.8 + "log"[Sal t]/[Acid]`
`implies "log"[Sal t]/[Acid] = 5.8-4.8 = 1`
`[Sal t]/[Acid] = Anti"log" of 1 = 10`
`[Sal t]/[Acid] = 1/10 = 0.1`

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