Transcript 651-ELECTROLYTIC CELL CELL PPT

ELECTROLYSIS
D.C. SOURCE
(BATTERY)
SLIDE ONE
OVERVIEW
ANIMATION
3e+
Au
THE ANODE IS SOLID
GOLD, THE SOURCE OF
GOLD IN THIS
REACTION.
+
Au0
+
Au3+
0
-Au
- Au3+ - -
THE ELECTROLYTE
SOLUTION, USUALLY
H2SO4
3e-
THIS COULD BE A
HEART CHARM
BRACELET PIECE TO
BE GOLD PLATED
THE CATHODE IS A
CHEAP PIECE OF
CONDUCTIVE
MATERIAL. THIS COULD
BE ANY CONDUCTIVE
(METAL) IN JEWELRY
TO BE GOLD PLATED.
ELECTROLYSIS
D.C. SOURCE
(BATTERY)
SLIDE TWO
NON
SPONTANEOUS
OXIDATION
AT ANODE
3e+
Au
The anode is solid
gold, this is the source
of Au(s). The DC
source forces the gold
to oxidize, It releases 3
electrons as it converts
to a Au(III) ion, which
then dissolves, the
anode loses mass.
+
Au0
+
Au3+
- --
Au0 Au3+ + 3eOXIDATION AT ANODE
An important
characteristic of the
electrolytic cell is that
the oxidation a LESS
active metal (bottom
position on table J).
ELECTROLYSIS
D.C. SOURCE
(BATTERY)
SLIDE THREE
ELECTRON
FLOW
THE D.C. SOURCE
ACTIVLEY “PUMPS”
ELECTRONS OUT OF
THE ANODE CAUSING
IT TO BE RELATIVLEY
POSITIVE COMPARED
TO THE CATHODE.
3e+
Au
+
Au0
+
Au3+
--
-
THE D.C. SOURCE
ACTIVLEY “PUMPS”
ELECTRONS ITO THE
CATHODE, CAUSING IT
TO BE NEGATIVE
RELATIVE TO THE
ANODE. THIS HIGH
DENSITY OF
ELECTRONS AT THE
CATHODE WILL
“FORCE” A REDUCTION
TO OCCUR.
ELECTROLYSIS
EX #1
D.C. SOURCE
(BATTERY)
SLIDE FOUR
NON
SPONTANEOUS
REDUCTION AT
CATHODE
THE GOLD(III)
CATIONS MIGRATE TO
THE ELECTRON RICH,
NEGATIVELY
CHARGED CATHODE.
Au3+
THE SOLID GOLD
THAT WAS
PRODUCED
DURING
REDUCTION
ELECTROPLATE
S THE CATHODE
AS SOLID GOLD
3e+
Au
-
Au3+
+
Au0
+
+ 3e- 
Au0
Au3+
-
3e-
Au0
REDUCTION AT CATHODE
THE GOLD(III)
CATIONS MIGRATE TO
THE ELECTRON RICH,
NEGATIVELY
CHARGED CATHODE
WHERE THEY WILL BE
FORCED TO BE
REDUCED TO Au0
SOLID.