More Redox Material

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More Redox Material

• AP Chemistry Unit 3

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Types of redox reactions

• Most synthesis (combination) decomposition are
  redox reactions
• Single replacement always redox
• Metathesis (double replacement) rarely redox
• Usually acid -base
• precipitation

No change in charge (oxidation state)
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Disproportionation Reactions

• H2O2 ? H2O O2
• An element is simultaneously oxidized and
  reduced.
• H2O2 ? H2O O2
• -1 -2 0

reduced
oxidized
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REDOX TITRATION

• Transfer of electrons

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How many mL of 0.206 M HI solution are needed to
reduce 22.5 mL of 0.374 M potassium permanganate

• 1. Write the balanced equation
• 10 HI 2 KMnO4 3H2SO4 ? 5I2 2MnSO4 K2SO4
  8H2O
• 2. Find moles of given
• 0.374 M __?__ 0.00842 moles KMnO4
• 0.0225 L
• 3. Use ratio and other info to calculate answer.
• 0.00842 moles x 10/2 0.0421 mole
• 0.206 M _0.0421 moles__ 0.204 L
  204 mL
• ?

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HW

• Prelab for redox titration
• HW8 due Monday.