Aqueous solution of ferric nitrate when mixed | vedclass

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Question

(A) The reaction between ferric ions and thiocyanate ions is given by: $Fe^{3+} (aq) + SCN^- (aq) \rightleftharpoons [Fe(SCN)]^{2+} (aq)$ (red colour)

Vedclass · Accepted Answer

Both $(I)$ and $(II)$ will decrease the intensity of the red colour.

Vedclass · Answer

(A) The reaction between ferric ions and thiocyanate ions is given by: $Fe^{3+} (aq) + SCN^- (aq) \rightleftharpoons [Fe(SCN)]^{2+} (aq)$ (red colour).When oxalic acid $(C_2H_2O_4)$ is added,it reacts with $Fe^{3+}$ ions to form a stable complex $[Fe(C_2O_4)_3]^{3-}$,which decreases the concentration of $Fe^{3+}$,shifting the equilibrium to the left and decreasing the red colour intensity.When mercuric chloride $(HgCl_2)$ is added,it reacts with $SCN^-$ ions to form a stable complex $[Hg(SCN)_4]^{2-}$,which decreases the concentration of $SCN^-$,shifting the equilibrium to the left and decreasing the red colour intensity.Therefore,both $(I)$ and $(II)$ will decrease the intensity of the red colour.

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