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c161l10_10_29 - Example What is the concentration of...

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Example Example W What is the concentration of ethanol if 20.00mL of the solution requires 5.65mL of 0.557M Cr 2 O 7 2- to reach the equivalence point? W 3CH 3 CH 2 OH + Cr 2 O 7 2- + 8H + 3CH 3 CHO + 2Cr 3+ + 7H 2 O 5.65mL × 0.557M = 3.15 mmol C 2 O 7 2- 3.15 mmol C 2 O 7 2- × 3mol CH 3 CH 2 OH/mol Cr 2 O 7 2- = 9.44mmol CH 3 CH 2 OH 9.44 mmol/20.00 mL = 0.472M
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Oxidizing and Reducing Agents Oxidizing and Reducing Agents W Oxidation and reduction are linked Oxidation occurs BECAUSE reduction occurs Reduction occurs BECAUSE oxidation occurs W The species that causes oxidation to occur is the oxidizing agent W The species that causes reduction is the reducing agent W The oxidizing agent is reduced and the reducing agent is oxidized
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Example Example W 6CO 2 (g) + 6H 2 O( l ) C 6 H 12 O 6 (s) + 6O 2 (g) +4 -2 +1 -2 0 +1 -2 0 C goes from +4 to 0, Reduction CO 2 is the oxidizing agent O goes from -2 to 0, Oxidation (either CO 2 or H 2 O could be the reducing agent)
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Classifying reactions Classifying reactions W Precipitations - ionic interactions Memorize solubility rules W Neutralizatons - reactions between acids and bases W Redox - changes in oxidation state
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Chapter 5 Chapter 5 Gases
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