Electrolysis Flashcards
(16 cards)
1
Q
Half equation for H+
A
2H+ + 2e- ➜ H2
2
Q
OILRIG
A
//
3
Q
What is the half equation for formation of oxygen
A
2O2- ➜ O2 + 4e-
4
Q
Ionic half equation of hydroxide going to…
A
4OH- ➜ O2 + 2H2O + 4e-
5
Q
Which side is oxidation
A
- Right:
- X- ➜ X + e-
6
Q
Which side is reduction
A
- left:
- X+ + e- ➜ X
7
Q
General equation for reduction
A
X+ + e- ➜ X
8
Q
General equation for oxidation
A
X- ➜ X + e-
9
Q
What charge is cathode
A
- negative charge
10
Q
What charge is anode
A
- positive charge
11
Q
Why use carbon (graphite) as the electrodes
A
- inert (so won’t react, dissolve or corrode)
- good conductor of electricity
- high melting point
12
Q
What forms at cathode for aqueous solutions
A
- hydrogen gas
- (if less reactivity) metal solid
13
Q
Are less reactive elements easier or harder to reduce
A
Easier
14
Q
Why are less reactive elements easier to reduce
A
They hold onto their ions less strongly
15
Q
What forms at anode for aq
A
- oxygen
- (if halogen) halogen
16
Q
Formation of oxygen at anode half equation:
A
4OH- ➜ O2 + 2H2O + 4e-
