Download App

Electrochemistry — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry4 Marks
Question
Obtain a relation between conductivity $( k )$ and molar conductivity $\left(\wedge_m\right.$ ).
✓

Answer

Conductivity or specific conductance $( k )$ is the conductance of $1 cm ^3$ of the solution in C.G.S. units, while molar conductivity is the conductance of a solution containing one mole of an electrolyte. Consider C molar solution, i.e., C moles of an electrolyte present in 1 litre or $1000 cm ^3$ of the solution.
$\therefore$ C moles of an electrolyte are present in $1000 cm ^3$ solution.
$\therefore 1$ mole of an electrolyte is present in $\frac{1000}{ C } cm$
solution.
Now,
$\therefore$ Conductance of $1 cm ^3$ of this solution is $K$,
$\therefore$ Conductance of $\frac{1000}{ C } cm ^3$ of the solution is $\frac{\kappa \times 1000}{C}$
This represents molar conductivity, $\wedge_{ m }$.
$\therefore \wedge_{ m }=\frac{\kappa \times 1000}{C} cm ^2 mol ^{-1}$ (in C.G.S units)
[In case of SI units :
Consider a solution in which $C$ moles of an electrolyte are present in $1 m ^3$ of solution.
Conductivity $k$ is the conductance of $1 m ^3$ of solution.
$\because$ C moles of an electrolyte are present in $1 m ^3$ solution.
$\therefore 1$ mol of an electrolyte is present in $\frac{1}{C}$ solution.
$\because$ Conductance of $1 m ^3$ of this solution is $K$.
$\therefore$ Conductance of $\frac{1}{C} m ^3$ of the solution is $\frac{\kappa}{ C }$
This represents molar conductivity, $\wedge_{ m }$.
$\therefore \Lambda_{ m }=\frac{\kappa}{ C } \Omega^{-1} m ^2 mol ^{-1} \text { (In SI units).] }$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following in detail." from Electrochemistry→Electrochemistry — all question types→Chemistry STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Coordination number used in coordination of compounds is somewhat different than that used in solid state. Explain.
→
Discuss the trends in the following in case of groups 16,17 and 18 elements.
(1) Atomic and ionic radii
(2) Ionisation enthalpy
(3) Electronegativity
(4) Electron gain enthalpy
→
Haloarenes are less reactive than haloalkanes.
→
For a hypothetical reaction, $A +2 B \rightarrow$ products, the concentration of $A$ and $B$ at different intervals of time are given in the following table. Find the rates of the reaction in terms of concentration changes in $A$ and $B$.
The equilibrium concentration of $A$ and $B$ at different time intervals :
Time t/minute $[ A ] / mol L ^{-1}$ $[ B ] / ml L ^{-1}$
$0$ $1.000$ $2.000$
$10$ $0.534$ $1.068$
$20$ $0.342$ $0.360$
$30$ $0.180$ $0.360$
→
Explain different types of oxides.
→
Describe different types of reversible electrodes with examples.
→
Give the structures and IUPAC names of isomeric phenols represented by the molecular formula $C _8 H _{10} O$.
→
What is an impurity defect? What are its types? Explain the formation of vacancies through aliovalent impurity with example.
→
Why does ozone act as a powerful oxidising agent?
→
A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why ?
→