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On the basis of following data, explain ...

On the basis of following data, explain why Co(III) is not stable in aqueous solution?
(1) `Co^(3+)(aq)+e rarr Co^(2+)(aq), E^(@)=+1.32V`
(2) `O_(2)(g)+4H^(+)(g)+4e rarr 2H_(2)O(l), E^(@)=+1.23V`

Text Solution

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The value of `E^(@)` for the half -cell reaction (1) is larger than that for the half - cell reaction (2), meaning `Co^(3+)(aq)` ion has a greater tendency to be reduced than does `O_(2)(g)`. So, in an aqueous solution, `Co^(3+)` ion will oxidise `H_(2)O`, and it will get reduced to `Co^(3+)` ion
`4Co^(3+)(aq)+2H_(2)O(l)rarr 4Co^(2+)(aq)+4H^(+)(aq)+O_(2)(g)`
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