INTRODUCTION
IObjective :
 To obtain the electrical conductivity of KCl and acetic acid solutions.

Finding out the limiting conductivity for the two solutions.

To find the dissociation constant of acetic acid.
IITheory :
Some substances that dissociate into ions by some suitable solvents can
conduct electricity. Therefore, the conductance of these solutions depends
on the degree of dissociation and the concentration of ions.
The electrical conductivity,
k
,
is the conductance of a cube of a solution
which is contained between two parallel electrodes 1 cm square and 1 cm
apart, and it can be found by:
k
G
l
A
=
(1)
Where,
G
= the conductance, S
l
= the length of material, cm
A = the crosssectional area, cm
2
K = the electrical conductivity, S cm
The molar conductivity,
Λ
, can be defined as,
Λ =
k c
/
(2)
The importance of the molar conductivity is that it gives information about
the conductivity of the ions produced in solution by 1 mol of a substance.
Where, c = the concentration, mol/ cm
3
c = the concentration, mol/ cm
3
Λ
= The molar conductivity, S cm
2
mol
1
In infinite dilution (c
→
0
), we have the limiting molar conductivity
Λ
0
,
which can expressed as,
Λ
0
=
λ
0
+
+
λ
0

(3)
2
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View Full DocumentSTRONG ELECTROLYTES
KCl is a one of the strong electrolytes that occur almost as ions when
they are in aqueous solution.
. It does obey the DebyeHuckel Onsager
equation,
Λ
=
Λ
0
 a
c
(4)
Where, a is a constant.
For strong electrolytes the molar conductivity falls only slightly as the
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 Spring '10
 AhmedGhazal
 Chemistry, Physical chemistry, Electrochemistry, strong electrolyte

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