Cr2O2-7 pH - a-CrO42-pH - b- Cr2O2-7Find the value of ab-

CrO_4^2 exists in basic medium while Cr_2O_7^2 exists in acidic medium. Cr_2O_7^2 pH gt;7⟶CrO_4^2 pH lt;7⟶Cr_2O_7^2 a=7, b=7 Value of ...

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Potassium Dichromate

Cr2O2-7 pH > ...

Question

$C r_{2} O_{7}^{2 -} p H > a \to C r O_{4}^{2 -} p H < b \to C r_{2} O_{7}^{2 -}$
Find the value of $\frac{a}{b}$ :

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Solution

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C r_{2} O_{7}^{2 -} p H = x - -- \to C r O_{4}^{2 -} p H = y - -- \to C r_{2} O_{7}^{2 -}

C r_{2} O_{7}^{2 -} + F e^{2 +} ⟶ F e^{3 +} + C r^{3 +} 1

C r_{2} O_{7}^{2 -}

25^{\circ} C

C r^{+ 3}, C r_{2} O_{7}^{2 -}

p O H = 11

0.01 M

C r^{3 +}

C r_{2} O_{7}^{2 -}

C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O

E^{\circ} = 1.33 V

C r_{2} O_{7}^{2 -}

C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} 2 C r^{3 +} + 7 H_{2} O

^{'} n^{'}

C r_{2} O_{7}^{2 -} + 14 H^{+} + + n F e^{2 +} \to 2 C r^{3 +} + n F e^{3 +} + 7 H_{2} O

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