Chapter 4 - Reactions in Aqueous Solution_Part7

Chapter 4 - Reactions in Aqueous Solution_Part7 - GENERAL...

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GENERAL CHEMISTRY CHAPTER 4 – REACTIONS IN AQUEOUS SOLUTION PAGE 31 OF 35 Disproportionation Reactions Disproportionation reaction = an element in one oxidation state is simultaneously oxidized and reduced One reactant always contains an element that can have at least three oxidation states The element itself is in an intermediate oxidation state Both higher and lower oxidation states exist for that element in the products Examples : 2H 2 O 2 (aq) 2H 2 O (l) + O 2 -1 -2 0 (g) O is oxidized O -1 O O is reduced O 0 -1 H H -2 2 O 2 Cl is both the oxidizing and reducing agent 2 (g) + 2OH - (aq) ClO - (aq) + Cl - (aq) + H 2 0 +1 -1 O (l) Cl is oxidized Cl 0 Cl Cl is reduced Cl +1 0 Cl Cl -1 2 This is the formation of household bleaching agents ; ClO is both the oxidizing and reducing agent - oxidizes color-bearing substances in stains
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GENERAL CHEMISTRY CHAPTER 4 – REACTIONS IN AQUEOUS SOLUTION PAGE 32 OF 35 Titration Reactions Acid-Base Often in the lab, a solution’s concentration is determined by re acting it with another material = titration In titration – a solution of accurately known concentration = standard solution is gradually added to another solution of unknown concentration until the chemical reaction between the two solutions is complete The standard solutions is added using a burette If we know the following: Volume of the standard solution Concentration of the standard solution
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Chapter 4 - Reactions in Aqueous Solution_Part7 - GENERAL...

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