7.90 A reddish colour appears on adding two drops of 0.002 M potassium thiocynate solution to 1 mL of 0.2 M iron(III) nitratesolution due to the formation of [Fe(SCN)]2+. Elaborate on the development of the reddish colour.
7.90 A reddish colour appears on adding two drops of 0.002 M potassium thiocynate solution to 1 mL of 0.2 M iron(III) nitratesolution due to the formation of [Fe(SCN)]2+. Elaborate on the development of the reddish colour.
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1 Answer
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The intensity of the red colour becomes constant on attaining equilibrium. This equilibrium can be shifted in either forward or reverse directions depending on adding a reactant or a product. The equilibrium can be shifted in the opposite direction by adding reagents that remove Fe3+or SCN– ions. For example, oxalic acidH2C2O4), reacts with Fe3+ ions to form testable complex ion [Fe (C2O4)3]3–, thus decreasing the concentration of free Fe3+ (aq).In accordance with the Le Chatelier's principle, the concentration stress of removed Fe3+ is relieved by dissociation of [Fe (SCN)]2+ to replenish the Fe3+ions. Because the concentration of
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