Electrochemistry 04 _ Class Notes __ Parishram 2025.pdf

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1. —2025—
FOR CLASS 127”

Chemistry

Fecha | 7
‘ Lecture - 04

By- Bharti Ma’am

®

lá

E. +

2. TOPICS ......., =

Functioning of cell when external volt
is applied

O se / |
©) Relation with Gibbs free energy
CON
Nernst Equation

3. CHAPTER NAM

3

A
Electrochemistry

nt
2

pe
ve

Er STE 4, D
ME lag ES = A

u,

4. Quick Revision WY,

| ae Eig os

ce pot: Eee A ESA

AN
E fee % 26 Cathode = Red
| “= cas] “a Anode > ona” / tea" fy

5. When E

0)

(i)

LY

Electrons flow from Zn rod to Cu rod
hence current flows from Cu to Zn.
I

Zn dissolves at anode and copper
deposits at cathode.

salt |
bridge fl +ve

6. When E,,, = 1.1 V

‘ext

(i) No flow of electrons or cura =
(ii) No chemical reaction.
% Zn

eier)
ZnSO, CuSO,

7. Or Zi aie
Eas) | (A
Electrons flow from Cu to Zn AE

current flows from Zn to Cu.
no

Ce

Zinc is deposited at the zinc

electrode and copper dissolves at

copper electrode.

8. ae ro) > (Se,
Code: te (K „97
LA ne

a (272
== N Aa > Ve

E. 2 er ù
Eee
Canods. Mews,

ES

9. Standard hydrogen electrode: Cus)

SRP of SHE has been assigned OV.
P=lbax | (a) Inert

Temp 298K Electrode

Con"= IM

#

VE

on platinum foil

The potential of individual half-cell cannot be measured. We can measure only the
difference between the two half-cell potentials that gives the emf of the cell.

10. a: ®

ave 1S Not Possible Lo determine Absolute Electrode Potenttad af, a

Electrode, 30 need a Refterente Electro Knownas Ç HE

ond actxdimy fo TUPAC Sok
*

SRP CHE = ze

Reductian [oxid” Pot of CHE = zur

11. SHE HSE Cast noe * Rect
: L

Anode: oud

Ÿ
Joss fe

4D) — ge + FH Cag)

Gaim of Ds

Sie
"ai
A Sr ge

Prem | H'canı | H, (g) Ubax)

Del 4,(9) (bar) | Hay)

12. HE

$ HE as Anode Oxyd stoss ofe-

Hq) —> ac + 29H Lag)

PEca)] 444) crown | Hag)

Gpe Y

CHE a foe
Red" dain

ate > = ae

Hate un

OS = Ha Y

DEC] Waa) |rumata)

13. PN
CN Measurement of electrode potential

<—>Y
Pt Electrode = +
I Hy Set tan
H,(g) at 1 atm — ef
Surose Preece, ut, HT
For Reutim gut +20 2 Hy)?

ARE

14. cn Y

Electsode pot ?

Ste || m*/ma)

Ss a + 2+
cay] 4.9 ea | HM ma
n

Anode

15. on platinum foil

16. @
> ElectroAL 7

Potential AG)

o zon
jrs Are. Re A AL
Amas. (QD) Catmde, (e 3uv =E%
oe me >Cu = S Cexthute
oxid”

17. ed”: Cathecle- @

Concept Check, A I
ed El = oy
|
oxed”: Anode. eh} M
ire = © =? 7
COL “Cathode at
pr 0) 34
‘geo Gory en
ie 0-4 +074 A)0-34

OMV [An

Ea”

18. o
ES ERA R=8:314 Jmal K
ne T=294 RK
F= 96500

19. Bani quest oP

2 qe iam

— Notes Comb:

— Revibe Cha SoluHm) $21 5
3 Tlecho chemishy Up + (DE)
x y Upto CC we)

21. D) Measuring Cylinder oR Reaker
=
Lows] upper venus |
>k Moy
hi BE

3Y/Color of Phenolphthalein
D Election oe

22. —— fs à ao arde