Summary
Summary - Unit 14 - Redox II
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REDOXIIHALF CELLS half
STANDARD HYDOGEN ELECTRODE (SHE
↳298k
rate
in an
eiee Chemical
↳ 100 UPA
↳ Imolan-3
standwa C
*
m
H2(g)
298k electrode potentials of
half cells can't be measured on their own !
use a reference SU E. .
= 0 00
.
OR ta Andverta
Sam
E
electrode
STANDARD ELECTRODE POTENTIAL
if using an ELECTRODE POTENTIALS
digit
EMF(Ecel) STEP 1 : clean metals with sandpaper
76
reduction b
removes surface impurities forward
way [cuzt(aq)
reaction
~
2(aq) + 2e- E2(s) = -
0 .
STEP 2 zeECs
W
kNO3
:
Wash surface with propanone + =
for
and wear gloves
enoves surface grease avoids
= 2n2+
-
2n(s) (aq) + 2e S
contamination
STEP 3
place each metal into a solution Cu2+(9)
:
+ 2n(s) = 2n2+ (aq) + (u(s)
containing the corresponding inn
2 Cusoy Cu electrode FACTORS :
temperature slow rare of reaction
-
reac
.
.
g for 10
concentration high activation
energy-may sto
pressure
↑
STEP 4 : link solutions using a salt bridge of
shift equilibrium
= shift cell potential value
file paper soared in UCI or KNO3
- this is why standard cond. are important to ensure
ions flow and the change balances the same values which allows us to make .
comparisons
STEP correct electrodes with wires , crocodile
G:
Excell Erreduced Eoxidised
= -
clips and a volmeter
.
Excell AS&
total
Excell < Ink
FUELCELLS supply of chemica
Mi
·
OT
Ohnote-tho (20
①
+ 2H20 + ye 40H cre
-Het 4 ② use
anod
e
H20t
overall :
02 + 212 +
2120
(they also work in acidic cond ) .
IODINE-S
↳ polymer electrolyte
Lion exchange
membrane
membranes
allow on - to pass ① measure approx . KlO3 to oxid
but not H2 or O2 6H
103 + 51 + -
ENERGY STORAGE CELLS
#
7 >
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