Redox Rxns

Question 1

What are the rules to assigning oxidation #’s ?

Answer 1

1. Free elements: 0
2. Ions: their charge
3. Group IA: +1
4. Group IIA: +2
5. Group VIIA: -1 (unless coupled w/ more electroneg. atom)
6. H: +1 (unless w/ less electroneg. atom)
7. O: -2 (except for peroxides & more electroneg)
8. Sum should be 0, or change of polyatomic ion

Question 2

A specific type of redox rxn that consists of an element undergoing both oxidation & reduction in producing the products is known as ?

Answer 2

Disproportionation (or dismutation) rxns

Question 3

A form of redox titration where no indicator is used is known as ?

Answer 3

Potentiometric titration (voltmeter is used instead)