The following half-reactions occur in acidic solution

CHEMISTRY · Subjective · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

The following half-reactions occur in acidic solution. Oxidation: Fe2+→Fe3++e−\mathrm{Fe^{2+} \rightarrow Fe^{3+} + e^-} Reduction: Cr2O72−+14 H++6 e−→2 Cr3++7 H2O\mathrm{Cr_2O_7^{2-} + 14\,H^+ + 6\,e^- \rightarrow 2\,Cr^{3+} + 7\,H_2O} Determine the smallest whole number by which the iron half-reaction must be multiplied so that all electrons cancel when the two half-reactions are added.

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