More Redox Material AP Chemistry Unit 3.

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Presentation transcript:

More Redox Material AP Chemistry Unit 3

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)

Disproportionation Reactions H2O2  H2O + O2 An element is simultaneously oxidized and reduced. -1 -2 0 reduced oxidized

REDOX TITRATION Transfer of electrons

How many mL of 0. 206 M HI solution are needed to reduce 22. 5 mL of 0 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 ?

HW: Prelab for redox titration HW#8 due Thursday. Gravimetric Analysis Lab due in portfolio 10/28/11