3.1.11 - Electrode Potentials and Cells

Question 1

Standard Hydrogen Electrode (SHE)

Answer 1

The measuring standard for half-cell potentials. It has a cell potential of 0V, measured under standard conditions

Question 2

Standard Conditions for SHE

Answer 2

Solutions of 1.0 mol dm^-3 conc, temp of 298k, 100kPa pressure

Question 3

SHE consists of…

Answer 3

Hydrochloric acid, hydrogen gas and uses platinum electrode. Useful as they are metallic so will conduct electricity but are also inert so will not interfere with the reactions

Question 4

Negative cell potential

Answer 4

substances are more easily oxidised and will lose electrons - better reducing agents

Question 5

Positive cell potentials

Answer 5

substances are more easily reduced and will gain electrons - better oxidising agents

Question 6

Effects of Concentration on EMF

Answer 6

increasing conc of solutions makes the cell EMF more positive

Question 7

Effects of pressure on EMF

Answer 7

increasing pressure of cell will make the cell EMF more negative

Question 8

Rechargeable cell full cell equation

Answer 8

Li + Li^+ + CoO_2 <—-> Li^+ + Li^+[CoO_2]