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Oxidation Number Method

Balance the e...

Question

Balance the equation
$F e^{2 +} + C r_{2} O_{7}^{2 -} \to C r^{3 +} + F e^{3 +}$

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Solution

$F e^{2 +} + C r_{2} O_{7}^{2 -} \to F e^{3 +} + C r^{3 +}$
$\begin{matrix} F e^{2 +} \to F e^{3 +} & C r_{2} O_{7}^{2 -} \to C r^{3 +} F e^{2 +} \to F e^{3 +} + e^{-} & C r_{2} O_{7}^{2 -} \to 2 C r^{3 +} 6 F e^{2 +} \to 6 F e^{3 +} + 6 e^{-} & C r_{2} O_{7}^{2 -} \to 2 C r^{3 +} + 7 H_{2} O C r_{2} O_{7}^{2 -} + 14 H^{+} \to 2 C r^{3 +} + 7 H_{2} O C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O \end{matrix}$
$C r_{2} O_{7}^{2 -} + 6 F e^{2 +} + 14 H^{+} \to 2 C r^{3 +} + 6 F e^{3 +} + 7 H_{2} O$

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