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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^(o+)(aq)` is `6.5 xx 10^(-3)`, what is the maximum `pH` value which could be used so that at least `80%` of the total iron `(III)` in a dilute solution exsists as `Fe^(3+)`?

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