\( K_{a} \) for the reaction; \( \mathrm{Fe}^{3+}(a q)+.\mathrm{H}_{2} \mathrm{O}(l) \rightlefth...

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\( K_{a} \) for the reaction; \( \mathrm{Fe}^{3+}(a q)+.\mathrm{H}_{2} \mathrm{O}(l) \rightleftharpoons \mathrm{Fe}(\mathrm{OH})^{2+}(a q)+.\mathrm{H}_{3} \mathrm{O}^{+}(a q \).\( ) is 6.5 \times 10^{-3} \). 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 \( \mathrm{Fe}^{3+} \) ?
(a) 2
(b) \( 2.41 \)
(c) \( 2.79 \)
(d) \( 1.59 \)
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