Ferric ion, Fe3+, reacts with thiocyanate ion, SCN-, to form the blood-red compl

Question

Ferric ion, Fe3+, reacts with thiocyanate ion, SCN-, to form the blood-red complex ion Fe(SCN)2+

Tell whether the intensity of the red color of the solution would increase or decrease for each of these changes: (a) addition of more Fe3+ ion, (b) addition of more SCN- ion, (c) addition of more Fe (SCN)2+ ion, (d) dilution with water, (e) addition of a catalyst, and (f) addition of a base to precipitate Fe(OH)3.

Ferric ion, Fe3+, reacts with thiocyanate ion, SCN-, to form the blood-red complex ion Fe(SCN)2+ Tell whether the intensity of the red color of the solution would increase or decrease for each of these changes: (a) addition of more Fe3+ ion, (b) addition of more SCN- ion, (c) addition of more Fe (SCN)2+ ion, (d) dilution with water, (e) addition of a catalyst, and (f) addition of a base to precipitate Fe(OH)3.

Explanation / Answer

a)Increases

Reason: Lechatlier's principle

b)Increases

Reason: Lechatlier's principle

c)Increases

Reason: Lechatlier's principle

d)Decreases

Reason: Decrease in concentration of products

e)Increases

Reason: catalyst accelerates the reaction without undergoing any chemical change

f)Decreases

Reason: formation of precipitate

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