When a solution of iron (III) is mixed with an iodide solution (e.g. KI), the resulting solution turns to a dark red-brown color, and a light vapor deposit of a similar color is sometimes observed around the puddle. Explain what is occuring in this system.

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
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Chapter16: Applications Of Neutralization Titrations
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Problem 16.3QAP
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When a solution of iron (III) is mixed with an iodide solution (e.g. KI), the resulting solution turns to a dark red-brown color, and a light vapor deposit of a similar color is sometimes observed around the puddle. Explain what is occuring in this system. 

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When a solution of iron (III) is mixed with an iodide solution (e.g. KI), the reaction can be written as :

Fe3+ (aq) + 2 I- (aq) → Fe2* (aq) + I2 (aq)
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