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Acetic acid, (CH(3)COOH), has a pK(a) of...

Acetic acid, `(CH_(3)COOH),` has a `pK_(a)` of `4.8`. Ethanol, `(CH_(3)CH_(2)OH)` has a `pK_(a)` of `16.0` . What are the major species present, when acetic and ethanol are added to water and th e pH is odjusted to `7.0`?

A

`CH_(3)H and CH_(3)CO_(2)OH`

B

`CH_(3)CH_(2)O^(-)and CH_(3)CH_(2)OH`

C

`CH_(3)COH and CH_(3)CH_(2)O^(-)`

D

`CH_(3)CO_(2)^(2)and CH_(3)CH_(2)OH`

Text Solution

Verified by Experts

The correct Answer is:
D
According to Henderson equation.
`pH=pK_(a)+log.(["salt"])/(["Acid"])`
`if pHgtpK_(a)rArr["Salt"]gt["acid"]`
or Comcemtration of basic part is more than acidic part while if `pHltpK_(a)`, (Acidic part ) `gt` (Basic part)
Thus, for `CH_(3)COOH "at" pH=7 " " , CH_(3)COO^(Ө)` exist more `(pK_(a)=4.8)`
`& " " "for" CH_(3)CH_(2)OH"at"pH=7 " " , CH_(3)CYH_(2)OH` exist more `(pK_(a)=16)`
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