15 mL of aqueous solution of Fe^(2+) in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr_(2)O_7^2 - . The molarity of the Fe^(2+) solution is __________ x 10^(-2) M. (Round off to the Nearest Integer).

15 mL of aqueous solution of Fe2 in acidic medium compl... | null (Chemistry) | DivineJEE

Exam

Chemistry

15 mL of aqueous solution of Fe²⁺ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr₂O

_7^{2 - }

. The molarity of the Fe²⁺ solution is __________

\times

10^-2 M. (Round off to the Nearest Integer).

Correct Answer:

C{r_2}{O_7}^{2 - } + F{e^{2 + }}\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}} C{r^{3 + }} + F{e^{3 + }}

Valance Factor of

C{r_2}{O_7}^{2 - }

= 6

Valance Factor of

F{e^{2 + }}

= 1

mili eq. of

C{r_2}{O_7}^{2 - }

= mili eq. of Fe²⁺

6(0.03

\times

20) = 1(M

\times

15)

M = 6(0.03)4/3

M = 0.24 M

M = 24

\times

10^{$-$
2} M

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