Electrochemistry 1 (Balancing REDOX)

Electrochemistry 1 for Chemistry for Engineers 1.

Electrochemistry

methods for inter-converting chemical energy and electrical energy

REDOX reactions

involve transfer of electrons between species

Reduction

gaining electrons, decreases oxidation number

Oxidation

losing electrons, increases oxidation number

Oxidizing agent

reactant that undergoes reduction

Reducing agent

undergoes oxidation

Acidic Step 1

A. balance elements other than O and H

Acidic Step 2

A. Balance O atoms with H2O on the opposite side

Acidic Step 3

A. Balance H atoms with H+ ions on the opposite side

Acidic Step 4

A. Balance charges with e- on the more positive side

Basic Step 1

B. Balance elements other than O and H

Basic Step 2

B. balance O atoms with H2O on the opposite side

Basic Step 3A

B. Balance H atoms with H+ ions on the opposite side

Baisc Step 3B

Balance H+ ions with OH- and convert to H2O

Basic 4

B. Balance charges with e- on the more positive side

Step 5

Combine half-reactions and cancel out common terms