Core Reactions: Redox

Core Reactions: Redox

Slide 27 of 42

Oxidizing and Reducing Agents: Uses

You will need to memorize the color change accompanying the redox reactions involving manganate(VII) and dichromate(VI) ions.

Chlorine is used as a household bleach because of it strong oxidizing power!

The active ingredient in bleach however is aqueous chlorate(I) (ClO-(aq)).

A reaction similar in principle to the one in the previous slide can be conducted to analyze chlorine bleach.

2H+ (aq) + ClO- (aq) + 2I - (aq) ® I2 (aq) + Cl- (aq) + H2O (l)

The analysis is completed by analyzing for the iodine produced by titrating the reaction mixture against a known concentration of sodium thiosulfate.

I2 (aq) + 2S2O32- (aq) ® 2I- (aq) + S4O62- (aq)

Similarly, analysis of iron content of a iron supplement tablet (as a compound of iron(II)) can be conducted also by performing a redox titration of the acidified tablet soution against potassium manganate(VII) solution.