ng chemch21.2

1
Electrochemistry Chapter 21.2 Electric Potential Measured in_________________ Results from a ___________________________________ If cell potential is ____, then the rxn is ___________________ Calculating Electric Potential: Refer to the Reduction Potential chart for Half- Reactions (page ______) Compare the 2 metals, determine which is ____________ on the chart _______the 2 Half-Reaction values together Example: A voltaic cell is made using the following rxn Fe +2 + 2 e - Fe E o = - 0.44 V Ag + + 1 e - Ag E o = + 0.80 V Determine the cell reaction and calculate the cell potential Example: Determine the cell potential using Cu +2 and Hg +2 Cu Cu +2 + 2e - E o = - 0.34 V Hg +2 + 2e - Hg E o = + 0.85 V

Upload: shashideshpande

Post on 17-Dec-2015

212 views

Category:

Documents


0 download

DESCRIPTION

chemistry

TRANSCRIPT

Electrochemistry

Electrochemistry

Chapter 21.2

Electric Potential

Measured in_________________

Results from a ___________________________________

If cell potential is ____, then the rxn is ___________________

Calculating Electric Potential:

1) Refer to the Reduction Potential chart for Half-Reactions (page ______)

2) Compare the 2 metals, determine which is ____________ on the chart

3) _______the 2 Half-Reaction values together

Example:

A voltaic cell is made using the following rxn

Fe+2 + 2 e- ( Fe

Eo = - 0.44 V

Ag+ + 1 e- ( Ag

Eo = + 0.80 V

Determine the cell reaction and calculate the cell potential

Example:

Determine the cell potential using Cu+2 and Hg+2

Cu ( Cu+2 + 2e-

Eo = - 0.34 V

Hg+2 + 2e- ( Hg

Eo = + 0.85 V