PATH 3200 Electrochemistry

potentiometry

measures potential difference when no current is flowing in volts, activity of individual electrodes are not measured

potentiometry measures

pH and pCO2

coulometry

measures electrical charge passing between 2 electrodes, measures total quantity, proportional of analyte concentration

coulometry measures

Cl-

amperometry

measures current at fixed potential difference in voltage between cells, proportional to analyte concentration

coulometry measures

pCO2

voltammetry

measures current when potential of 1 electrodes relative to another as a function of time

voltammetry measures

Vitamin C

electric charge

q, measured in coulombs

electric current

I, measured in amperes

electrical work

W, measured in joules

potential difference

E, measured in volts

galvanic cells

chemical to electrical energy, spontaneous

electrolytic cells

chemical reactions using and outside potential difference

electrolysis

voltage to drive a reaction that isn’t energetically favorable

Ampere

coulombs per seconds

volts

joules/coulombs

q

n x N x F

work

E x q

Electrolyte

conductive solutions formed by dissociation of electrons

electrode

conducts electrons into/out of chemical species

reference electrode

maintain constant potential

indicator electrode

changes potential in response to analyte concentration changes

anode

electrode where oxidation occurs

cathode

electrode where reduction occurs