CHEM1100 Lecture Notes - Lecture 12: Standard Cell, Salt Bridge, Membrane Potential
Document Summary
Salt bridge: a salt bridge contains a solution of an inert salt, the salt bridge allows the movement of ions into the two solutions neutralising any charges that form. Standard cell notation for galvanic cells: by convention, half-cell with anode is on left, half-cell with cathode is on right, single vertical line is phase boundary, double vertical lines is salt bridge. Cell potential: the maximum potential that a cell can generate is the cell potential (ecell, based on standard cell notation, the cell potential is calculated from: Ecell = er el = ecathode eanode (where ecathode is the potential for the cathodic (right) and eanode the anodic (left) half-cells: ecell can depend on electrode composition, ion concentrations, t and p. Standard cell potential: to compare potential of different cells the standard cell potential is used (e , the standard cell potential is calculated from: E : standard conditions: cathode - e cell) cell = e anode.