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Stoichiometric Calculations

What volume o...

Question

What volume of $0.05 M K_{2} C r_{2} O_{7}$ in acidic medium is needed for complete oxidation of $200$ mL of $0.6 M$ $F e C_{2} O_{4}$ solution?

1.4

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1.2

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120

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800

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Solution

The correct option is A $1.2$ L
$C r_{2} O_{7}^{2 -} 0.05 M + F e C_{2} O_{4} 0.6 M / 200 m L H^{⨁} \to$ $C r_{2} O_{7}^{2 -} + 14 H^{⨁} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$
$F e^{2 +} \to F e^{3 +} + e^{-}$ ;
$C_{2} O_{4}^{2 -} \to 2 C O_{2} + 2 e^{-}$
$F e C_{2} O_{4} \to F e^{3 +} + 2 C O_{2} + 3 e^{-}$
$m . E q . o f K_{2} C r_{2} O_{7} \equiv m . E q . o f F e C_{2} O_{4}$
$(0.05 \times 6) \times V = (0.6 \times 3) \times 200$
$\Rightarrow V = 1200 m L = 1.2 L$

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