Electrochemistry Short Notes(NEET Focused), Study notes of Chemistry

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ELECTRO CHEMISTRY

::::^

:

Conductivity Electrolysis Batteries 2

• 2 Q

Is

ELECTROCHEMICAL (^) CELLS

Electrochemistry

:

study of production^ of^

elect

from energy

released (^) during spontaneous chemical reactions and (^) use of

electrical

energy to

bring

about (^) non (^) spontaneous chemical reactions (^).

Daniell Cell

• (^) converts chemical energy liberated during the

redox reaction to electrical

energy . ( voltaic cell 1 Galvanic (^) cell) Zn (^) (s) + wYaq, 2nYaqf^

Cues)

Electric (^) potential =^ I - IV (^).

combination

of

(^2) half reactions

• Cee " t (^) 2e -

→ Cu (s)

(Reduction^ half)

• 2n^ (s) -^ Zn^ " (^) t (^) 2e- (onidation^ half) These (^) reactions (^) occur in two (^) different portions of

Daniel cell .

These two^ portions called as : Half cells^ / Redon^ couples. The electrolytes of^ two (^) half cells^ are connected

internally through

a Salt

Bridge.

In (s) 2n

" Cag) +^ 2e

• At Anode

cutey)

t 2e - arts) at cathode

2nd) t^ Cu "

Cag) Zn

" Cag) t^ cuts) Representation : (^) znlzn " II cut^ ' Icu

Emf

of cell^ = (^) Eanode t^ Ecathode = Oxidation^ potential +^ Reduction of anode potential (^) of cathode = (^) Reduction potential

• Reduction of cathode -

potential of

.

anode

standard hydrogen Electrode Hz →^ 2Mt^ t^ 2e

• O - OV (^) (Anode)

2Mt t^ 2e

• → (^) Hz O^ - OV^ (cathode)

with help of SHE - the standard Reduction

potential values of all electrodes has been determined and^ placed in^ electrochemical series (^).

Nernst Equation

[cell = (^) Ecole - 2n3foI log Products (Reactant) C-cell = Eide - 00h51 log^ Chocked (Reactant) E- (^) cell

for

2n Cs) t^ Cee"

Cag) → (^) Zn" Cag) t^ Cues) Ecole =^ Eceee - 00529L log^ C2n (Aest) Conductivity Electrolytic conductance :^

conductance is the

property of^ conductor which

facilitates

the flow (^) of (^) electricity .

Conductance =^1

Resistivity k = I R

e

La (^) (La : cell constant )

Hey

Iie

Ima Relation between (^) dm and^ Reg Reg = dmv- f.

• Law^ useful to (^) measure conductivity of a (^) weak electrolyte .

Electrolysis

• Sn an electrolytic cell :^ electrical energy

is passed to^ bring about^ redox^ reaction

which is otherwise non -

spontaneous.

Faraday 's laws 1st Law^ 2nd^

Law

E

of (^) Wei

• • we . Ez weight of a Quantity substance (^) of

electricity

liberated (^) passed

w do

w =^20 f-^ =^96500

W - -^ zit

Z :^ Electrochemical 2 - - (^) E

Equivalent

F

Previous YEARS (^) Impe.