Question

Calculate the equivalent weight of Cr2O7-2 in acidic medium

Answer 1

ph gskCr4o0-7h
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Answer 2

Answer: The equivalent weight of $Cr_2O_7^{2-}$ in acidic medium will be 36 g/eq.

Explanation:

To calculate the equivalent weight in a redox reaction, we use the formula:

$\text{Equivalent weight}=\frac{\text{Molecular mass}}{\text{Number of electrons gained or lost}}$

For the reaction of $Cr_2O_7^{2-}$ in acidic medium, the equation follows:

$Cr_2O_7^{2-}+14H^++6e^-\rightarrow 2Cr^{3+}+7H_2O$

Molecular mass of $Cr_2O_7^{2-}$ = 216 g/mol

Number of electrons gained = 6

Putting values in above equation, we get:

$\text{Equivalent weight}=\frac{216}{6}=36g/eq.$

Hence, the equivalent weight of $Cr_2O_7^{2-}$ in acidic medium will be 36 g/eq.