Chemical Equilibrium Question 3
Question 3 - 2024 (31 Jan Shift 1)
For the given reaction, choose the correct expression of $K _C$ from the following :-
$Fe _{(aq)}^{3+}+SCN _{(aq)}^{-} \rightleftharpoons(FeSCN) _{(aq)}^{2+}$
(1) $K _C=\frac{\left[FeSCN^{2+}\right]}{\left[Fe^{3+}\right]\left[SCN^{-}\right]}$
(2) $K _C=\frac{\left[Fe^{3+}\right]\left[SCN^{-}\right]}{\left[FeSCN^{2+}\right]}$
(3) $K _C=\frac{\left[FeSCN^{2+}\right]}{\left[Fe^{3+}\right]^{2}\left[SCN^{-}\right]^{2}}$
(4) $K _C=\frac{\left[FeSCN^{2+}\right]^{2}}{\left[Fe^{3+}\right]\left[SCN^{-}\right]}$
Show Answer
Answer (1)
Solution
$K _C=\frac{\text { Products ion conc. }}{\text { Reactants ion conc. }}$
$K _C=\frac{\left[FeSCN^{2+}\right]}{\left[Fe^{3+}\right]\left[SCN^{-}\right]}$
