ELECTRODE POTENTIAL SME Flashcards
1
Q
what is electrode potential?
A
- is a value which shows how easy a substance is reduced
- the more positive an electrode potential is, the more likely the species will undergo reduction
2
Q
what is the salt bridge
A
- completes the circuit
- allows ions to flow
- un reactive with solutions
3
Q
how do we do cell format
A
oxidation on left
reduction on right
different state? phase boundary
salt bridge with douvle lines
4
Q
what are standard conditions
A
298K
100kPa
ion conc of 1.00moldm^-3
5
Q
what is meant by standard electrode potential?
A
- the potential difference produced when a standard half-cell is connected to a standard hydrogen electrode under standard conditions
6
Q
what happens if an electrode isnt a metal?
A
- platinum electrode is used
7
Q
why is a platinum electrode used?
A
- inert and does not take part in reaction
8
Q
how do you calculate Ecell?
A
Erhs - Elhs
or
Ered - Eoxi
9
Q
how do we determine electron flow?
A
- look at Emf values
- species that will accept is LHS more positive
- species that donates is RHS negative
