Ferrous sulfate 1FeSO42 is often used as a coagulant in

Chapter , Problem 18.53

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Ferrous sulfate 1FeSO42 is often used as a coagulant in water purification. The iron(II) salt is dissolved in the water to be purified, then oxidized to the iron(III) state by dissolved oxygen, at which time gelatinous Fe1OH23 forms, assuming the pH is above approximately 6. Write balanced chemical equations for the oxidation of Fe 2+ to Fe 3+ by dissolved oxygen and for the formation of Fe1OH231s2 by reaction of Fe 3+1aq2 with HCO3 -1aq2.

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