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Unformatted text preview: ctrochemical cell.
The cell diagram has a "right hand" electrode (here a piece of silver wire) and a "left
hand" electrode (here a piece of copper wire). A single vertical line means that the two
species flanking it have different phases. In this case, the two phases are the solid wires
and the liquid solutions whose concentrations are specified inside the parentheses. The
double vertical line implies some type of chemically inert salt bridge connecting the two
compartments in question.
The algebraic sign of a cell containing a spontaneous reaction is always a positive
voltage. A negative voltage reading is possible in this experiment even though all the
reactions are spontaneous. If a negative voltage is measured, then the cell diagram is
written in reverse of the spontaneous direction of the cell. A correct cell diagram of a
spontaneous redox reaction has the anode written on the left of the double vertical line
and the cathode written to the right.
In this experiment you will construct and measure the voltage of electrochemical cells
that involve the half-reactions (in alphabetical order): Cu2+ + 2e- Cu, Fe3+ + e- Fe2...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07