Slide 1 : CONDUCTIVITY OF SOLUTIONS
Slide 2 : MOLAR CONDUCTIVITY
STRONG ELECTROLYTES
WEAK ELECTROLYTES
KOHLRASCH’LAW
Slide 3 : iv) Temperature
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Slide 10 : R a l/A or R = ? l /A
? = R/ l/A = R x A/l
( O xm2/m) = (O meter)
Slide 11 : where ? is called the resistivity (specific resistance).Its unit in SI system is ohm meter (O meter) or its sub units ohm centimeter (O cm).
(If l = 1 m and A = 1 m2, then R = ?
Resistivity for a substance is defined as its resistance offered when it is one meter long and its area of cross section is one m2
1Om =100 Ocm or 1 Ocm = 0. 01 O m
Slide 12 : And it is equal ohm-1 or mho or O-1 The inverse of resistivity called conductivity (specific conductance) represented by k (kappa).Its SI unit is Siemens S m-1 or S cm-1
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Slide 14 : Conductance G =1/R or G = A/?l = k A/l
1/? = k
Conductivity of a material in Sm-1 is conductance offered by a material of one meter long and its area of cross section 1m2
1Sm-1 = 100Scm-1
k = 1/?, k = kappa - the specific conductance or conductivity
The unit of specific conductance is ohm-1 cm-1.
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