| |
IMAGE. The cell design described in this module includes two solutions connected by salt bridge (piece of string) and two electrodes (metal strips) connected to a voltmeter (not shown)
|
When two half-cells are connected, as in the image, the voltmeter measures the difference between the potential of each half-cell. When Ecell is positive, this relationship is expressed as:
Ecell = Ecathode - Eanode
It is important to become familiar with the vocabulary and conventions used during an electrochemical investigation, so review material in your textbook related to electrochemistry before attending lab. Usually, textbooks devote a whole chapter to electrochemical concepts and calculations. Use the textbook's index to find material on electrochemical cells, electrodes, electrolysis, electrolytes, and reactions (oxidation-reduction).
|
