Ans: The equivalent conduction at the infinite dilution (Λ°), for an electrolyte is calculated by the use of Kohlrausch’s law. It states that,
At infinite dilution, each of the ion makes a constant contribution towards the equivalent conductivity of an electrolyte, this is irrespective of the nature of the other ion that is present in the solution.
the expression for the equivalent conductance at infinite dilution of Al2(SO4)3 is:
Λ°(Al2(SO4)3) = 2Λ°(Al^3+) + 3Λ°(SO4^2-)
Since equivalent conductance's are given only for ions, the equivalent conductance at infinite dilution,
Λ°(Al^3+) + Λ°(SO4^2-)
Standard electrode potential for \( \text{Sn}^{4+}/\text{Sn}^{2+} \) couple is +0.15 V and that for the \( \text{Cr}^{3+}/\text{Cr} \) couple is -0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be:
To calculate the cell potential (\( E^\circ_{\text{cell}} \)), we use the standard electrode potentials of the given redox couples.
Given data:
\( E^\circ_{\text{Sn}^{4+}/\text{Sn}^{2+}} = +0.15V \)
\( E^\circ_{\text{Cr}^{3+}/\text{Cr}} = -0.74V \)
(a.)Write the anode and cathode reactions and the overall cell reaction occurring in a lead storage battery during its use.
List-I | List-II | ||
(A) | 1 mol of H2O to O2 | (I) | 3F |
(B) | 1 mol of MnO-4 to Mn2+ | (II) | 2F |
(C) | 1.5 mol of Ca from molten CaCl2 | (III) | 1F |
(D) | 1 mol of FeO to Fe2O3 | (IV) | 5F |
An electrochemical cell is a device that is used to create electrical energy through the chemical reactions which are involved in it. The electrical energy supplied to electrochemical cells is used to smooth the chemical reactions. In the electrochemical cell, the involved devices have the ability to convert the chemical energy to electrical energy or vice-versa.