1. More Redox Material
AP Chemistry Unit 3

2. 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)

3. Disproportionation Reactions
H2O2  H2O + O2
An element is simultaneously oxidized and reduced.
reduced
oxidized

4. REDOX TITRATION
Transfer of electrons

5. How many mL of 0. 206 M HI solution are needed to reduce 22. 5 mL of 0
How many mL of M HI solution are needed to reduce 22.5 mL of 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 = __?__ moles KMnO4 L
3. Use ratio and other info to calculate answer.
moles x 10/2 = mole
0.206 M = _ moles__ L = 204 mL ?

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