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E(Al^(3+)//Al)^(@)=-1.66 V and K(SP) of ...

`E_(Al^(3+)//Al)^(@)=-1.66 V` and `K_(SP)` of `Al(OH)_(3)=1.0xx10^(-33)`. Reduction potential of the above couple at `pH=14` is `:`

A

`-2.31 V`

B

`+2.31`

C

`-1.01V`

D

`+1.01V`

Text Solution

Verified by Experts

The correct Answer is:
A
`pH=14" "rArr" "[CH^(-)]=1M`
`[Al^(3+)]=(K_(sp))/([CH^(-)]^(3))=10^(-33)`
`Al^(3+)+3e^(-)rarr Al`
`E_(cell)=E_(Al^(3+)//Al)^(@)-(0.0591)/(3)log.(1)/([Al^(3+)])`
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