15 mL of aqueous solution of Fe2 in acidic medium completely

Question

15 mL of aqueous solution of Fe²⁺ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr₂O. The molarity of the Fe²⁺ solution is __________ 10^-2

Accepted Answer

Cr_2O_7^2 - + Fe^2 + 0pt _ Cr^3 + + Fe^3 +

Valance Factor of Cr_2O_7^2 - = 6

Valance Factor of Fe^2 + = 1

mili eq. of Cr_2O_7^2 - = mili eq. of Fe²⁺

6(0.03 20) = 1(M 15)

M = 6(0.03)4/3

M = 0.24 M

M = 24 10^-2 M...

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