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236
(c) Molar conductivity : It is defined as the conducting power of all the ions produced by
dissolving one mole of an electrolyte in solution.
*2.
Ans.
Give SI units of (a) resistivity, (b) conductivity, (c) molar conductivity.
l
a
l
or R = ρ or ρ = R
a
l
a
The proportionality constant ρ is called resistivity of the conductor.
(a) Resistivity : R ∝
(b) Conductivity : G =
a
1 a
× = k×
ρ l
l
The proportionality constant k is called conductivity of the conductor.
or k = G
1 l
l
×
=
R a
a
(c) Molar Conductivity : In SI units :
L
*3.
Ans.
k
Sm –1
=
=
=
C
mol m –3
S m2 mol–1
Explain the terms conductivity and molar conductivity. How are they interrelated?
G=
a
1 a
× = k×
l
ρ l
1 l
l
= ×
R a
a
(a) The conductivity (k) is defined as the conductance of unit cube of a solution of an electrolyte.
(b) Molar conductivity is defined as the conducting power of all the ions produced by dissolving
one made of an electrolyte in solution.
Relation between conductivity (k) and molar conductivity (L) :
L = k × V
The proportionality constant k is called conductivity of the conductor or k = G
V = volume of solution containing one mole of the electrolyte or L = k ×
1000
C
c = molar concentration, i.e. mol–1 (or mol dm–3)
*4.
Ans.
Why does conductivity of a solution decreases on dilution of the solution?
(a) The conductivity is the conductance of unit volume of solution (say 1 cm3) and depends
on the number of ions present in unit volume.
(b) On dilution i.e. on decreasing the concentration of solution, the number of ions per unit
volume decreases. Hence, conductivity of solution decreases.
Unique Solutions ®
S.Y.J.C. Science - Chemistry - Part I
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