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[K(0)" for the reaction; "],[Fe^(2+)(xq,...

[K_(0)" for the reaction; "],[Fe^(2+)(xq,1+H_(2)O(1)rightleftharpoons Fe(OH)^(2)(aq)+H_(3)O^(-)(aq)" is "5times10^(-3)." What is the maximum pH value which could be "],[" used so that at least "80%" of the totaliron (lil) in in a dilute solution exists as "Fe^(3+2)" ."]

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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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