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K(a) for CH(3)COOH at 25^(@)C is 1.754xx...

`K_(a)` for `CH_(3)COOH` at `25^(@)C` is `1.754xx10^(5)`. At `50^(@)C, K_(a)` is `1.633xx10^(-5)` what are `Delta H^(@)` and `Delta S^(@)` for the ionisation of `CH_(3)COOH` ?

Text Solution

Verified by Experts

`(DeltaG^(@))_(298)=-2.303RTlogK`
`=-2.303xx8.314xx298xxlog(1.754xx10^(-5))`
`=27194J`
`(DeltaG^(@))_(298)=-2.303xx8.314xx323xxlog(1.633xx10^(-5))`
`=29605J`
`DeltaG^(@)=DeltaH^(@)-TDeltaS^(@)`
`29605=DeltaH^(@)-323DeltaS^(@)`
`:.DeltaH^(@)=-1.55kJ//mol`
`DeltaS^(@)=-96.44J//molK`
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RC MUKHERJEE-CHEMICAL THERMODYNAMICS-Objective problems
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  13. In which case of mixing of a strong acid and a base each of 1N concent...

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