Ferris ions, Fe3+ react with thiocyanite ions SCN^- according to Fe3+(aq) + 3SCN

Question

Ferris ions, Fe3+ react with thiocyanite ions SCN^- according to Fe3+(aq) + 3SCN^-(aq) <---> Fe(SCN)3(aq)

The Fe(SCN)3(aq) complex is a red color. If you add a few drops of NaOH(aq) to a solution containing the chemical equilibrium described by the reaction above what happens?

A) the equilibrium shifts to the left and the solution becomes a darker red color

B) the equilibrium shifts to the right and the solution becomes a darker red color

C) the equilibrium shifts to the left and the solution becomes a lighter red

D) the equilibrium shifts to the right and the solution becomes a lighter red color

Explanation / Answer

addition of NaOH will lead to the formation of Fe(OH)3 by the reaction of Fe(+3) with OH- ions, due to which the concentration of Fe(+3) ions will reduce and hence the equilibrium willl be disturbed in order to reach the equilibrium points, the reaction must proceed in the left direction to equalise the reduction in Fe(+3)

The color will change from darker red to lighter red

Hence the correct answer is Option C

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