An In-Depth Concept of Electrochemistry For IIT JEE (CHEMISTRY) Exams. Join Studyduniya.com for More. https://bit.ly/2qah89y

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Electrolytic cell is a device for using
electrical energy to carry non-spontaneous
chemical reactions.
ELECTROLYTIC CELL

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ELECTROLYTIC CELL

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The cell converts the chemical energy
liberated during the redox reaction to
electrical energy and has an electrical
potential equal to 1.1 V. when concentration
of Zn2+ and Cu2+ ions is unity. Such a device
is called a galvanic or a voltaic cell.
DANIELL CELL

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DANIELL CELL

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The reduction half reaction occurs on the
copper electrode while the oxidation half
reaction occurs on the zinc electrode. These
two portions of the cell are also called half-
cells or redox couples.
DANIELL CELL

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The standard hydrogen electrode consists of
a platinum electrode coated with platinum
black. The electrode is dipped in an acidic
solution and pure hydrogen gas is bubbled
through it.
STANDARD ELECTRODE POTENTIAL

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NERNST EQUATION

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RELATIONS FROM NERNST EQUATION

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(i) the nature of the electrolyte added
(ii) size of the ions produced and their
solvation
(iii) the nature of the solvent and its viscosity
(iv) concentration of the electrolyte
(v) temperature
CONDUCTANCE OF
ELECTROLYTIC SOLUTIONS
The conductivity of electrolytic (ionic)
solutions depends on:

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The SI unit of conductance is siemens,
represented by the symbol ‘S’ and is equal
to ohm
CONDUCTANCE OF
ELECTROLYTIC SOLUTIONS
-1

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CONDUCTIVITY OF IONIC SOLUTIONS

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Kohlrausch law of independent migration of
ions states that limiting molar conductivity
of an electrolyte can be represented as the
sum of the individual contributions of the
anion and cation of the electrolyte.
KOHLRAUSCH LAW

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WEAK ELECTROLYTES

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The amount of chemical reaction which
occurs at any electrode during electrolysis
by a current is proportional to the quantity
of electricity passed through the electrolyte
FARADAY’S LAWS OF ELECTROLYSIS
First Law:

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The amounts of different substances
liberated by the same quantity of electricity
passing through the electrolytic solution are
proportional to their chemical equivalent
weights.
FARADAY’S LAWS OF ELECTROLYSIS
Second Law:

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Fuel cell using H2 and O2 produces electricity.
FUEL CELLS