Write the equation showing the relationship between equivalent or molar conductance and concentration of a strong electrolyte.
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The conductance is the property of the conductor (metallic as well as electrolytic) which facilitates the flow of electricity through it. It is equal to the reciprocal of resistance i.e.,
Units of conductance :
Specific Conductance or Conductivity
The resistance of any conductor varies directly as its length (l) and inversely as its cross-sectional area (A), i.e.,
Mathematically
Where ρ is called the specific resistance.
l/A is known as cell constant.
If l = 1 cm and A = 1 cm2, then
R = ρ
The specific resistance is, thus defined as the resistance of one centimeter cube of a conductor.
The reciprocal of specific resistance is termed the specific conductance or it is the conductance of one centimeter cube of a conductor.
It is denoted by the symbo
Thus,
Where kappa → the specific conductance
Specific conductance is also called conductivity.
Further,
or Specific conductance = Conductance × cell constant
In the case of electrolytic solutions, the specific conductance is defined as the conductance of a solution of definite dilution enclosed in a cell having two electrodes of unit area separated by one centimeter apart.
Unit of specific conductance:
Equivalent Conductance
One of the factors on which the conductance of an electrolytic solution depends is the concentration of the solution.
In order to obtain comparable results for different electrolytes, it is necessary to take equivalent conductance's.
Equivalent conductance is defined as the conductance of all the ions produced by one gram equivalent of an electrolyte in a given solution.
It is denoted by A.
To understand the manning of equivalent conductance, imagine a rectangular trough with two opposite sides made of metallic conductor (acting as electrodes) exactly 1 cm apart, If 1 cm3 (1 mL) solution containing 1 gram equivalent of an electrolyte is places in this container is measured.
According to definitions,
Conductance = Specific conductance (K) = Equivalent conductance
If the solution is diluted to say (9 cm3) (9 mL), the conductance of the solution will be the same but specific conductance becomes 1/9th as it contains nine cubes.
The conductance is also equal to the equivalent because the solution still has 1 g equivalent of the electrolyte.
Equivalent conductance () = 9 × k
In general,
=k × V
where V is the volume in mL containing 1 g equivalent of the electrolyte.
Units of conductance :
Specific Conductance or Conductivity
The resistance of any conductor varies directly as its length (l) and inversely as its cross-sectional area (A), i.e.,
Mathematically
Where ρ is called the specific resistance.
l/A is known as cell constant.
If l = 1 cm and A = 1 cm2, then
R = ρ
The specific resistance is, thus defined as the resistance of one centimeter cube of a conductor.
The reciprocal of specific resistance is termed the specific conductance or it is the conductance of one centimeter cube of a conductor.
It is denoted by the symbo
Thus,
Where kappa → the specific conductance
Specific conductance is also called conductivity.
Further,
or Specific conductance = Conductance × cell constant
In the case of electrolytic solutions, the specific conductance is defined as the conductance of a solution of definite dilution enclosed in a cell having two electrodes of unit area separated by one centimeter apart.
Unit of specific conductance:
Equivalent Conductance
One of the factors on which the conductance of an electrolytic solution depends is the concentration of the solution.
In order to obtain comparable results for different electrolytes, it is necessary to take equivalent conductance's.
Equivalent conductance is defined as the conductance of all the ions produced by one gram equivalent of an electrolyte in a given solution.
It is denoted by A.
To understand the manning of equivalent conductance, imagine a rectangular trough with two opposite sides made of metallic conductor (acting as electrodes) exactly 1 cm apart, If 1 cm3 (1 mL) solution containing 1 gram equivalent of an electrolyte is places in this container is measured.
According to definitions,
Conductance = Specific conductance (K) = Equivalent conductance
If the solution is diluted to say (9 cm3) (9 mL), the conductance of the solution will be the same but specific conductance becomes 1/9th as it contains nine cubes.
The conductance is also equal to the equivalent because the solution still has 1 g equivalent of the electrolyte.
Equivalent conductance () = 9 × k
In general,
=k × V
where V is the volume in mL containing 1 g equivalent of the electrolyte.
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