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K(a) for the reaction, Fe^(3+)(aq.)+H(2)...

`K_(a)` for the reaction, `Fe^(3+)(aq.)+H_(2)O(l)hArr Fe(OH)^(2+)(aq.)+H_(3)O^(+)(aq.)` is `6.5xx10^(-3)` What is the max. pH value which could be used so that at least `80%` of the total iron (III) in a dilute solution exists as `Fe^(3+)`?

Text Solution

Verified by Experts

`{:(Fe^(3+)+,H_(2)OhArr,Fe(OH)^(2+)+,H^(+),,K_(h)=6.5xx10^(-3)),((1-h),,h,h,):}`
`[H^(o+)] = Ch`
and `K_(h) = (C.h^(2))/(1-h)` and `h = (5)/(100)`
Thus, `6.5 xx 10^(-3) = (C xx5xx5xx100)/(100xx100xx95)`
`:. C = 2.47 M :. [H^(o+)] = 2.47 xx (5)/(100)`
`:. pH = 0.9083`
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