Name: Applications of Electrochemical Series
Uploaded: 2019-07-19
Duration: 29 min 46 s
Description: Electrochemical series helps not only to predict the feasibility of redox reactions, but has other applications too. Find out more applications of the series...

Question

Define equivalent and molar conductance. Give their relationship with specific conductance. How does equivalent conductance vary with increase in temperature?

How many atoms of calcium will be deposited from fused ${CaCl}_{2}$ by a current of $25$ milliamperes passes for $60$ seconds?

Accepted Answer

The equivalent conductance of an electrolyte is defined as the conductance of a volume of solution containing one equivalent weight of dissolved substance when placed between two parallel electrodes $1 cm$ apart, and large enough to contain between them all of the solution. Its unit is $Ω^{- 1} {cm}^{2} {eq}^{- 1}$

Molar conductance : It is the conductance of all ions furnished by one mole of an electrolyte present in a definite volume of the solution.
Its unit is ${ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ .

Specific conductance is defined as the conducting capacity of a solution of the dissolved electrolyte and the whole solution is being placed between two electrodes are $1$ sq. cm and length $1$ cm. Its unit $Ω^{- 1} {cm}^{- 1}$ . It is related with equivalent and molar conductance as follows- $Λ_{eq} = \frac{κ \times 1000}{N}; Λ_{m} = \frac{κ \times 1000}{M}$ where $Λ_{eq}$ is the equivalent conductance, $Λ_{m}$ is the molar conductance and $κ$ is the specific conductance. With the increase of the temperature the inter ionic attraction decreases hence mobility increases which in turn increases the equivalent conductance of solution.

The mass $(m)$ of calcium deposited is given by faraday's first law-

$m = Z \times I \times t$

But, $Z = \frac{Equivalent weight}{96500}$

Put the value of $Z$ in above equation, we get :

$60$

$m = 3.1 \times 10^{- 4}$

No. of moles $= \frac{3.1 \times 10^{- 4}}{40} = 7.75 \times 10^{- 6} mols$

No. of atoms $= 7.75 \times 10^{- 6} \times 6.022 \times 10^{23} = 4.67 \times 10^{16}$

Define equivalent and molar conductance. Give their relationship with specific conductance. How does equivalent conductance vary with increase in temperature?

How many atoms of calcium will be deposited from fused ${CaCl}_{2}$ by a current of $25$ milliamperes passes for $60$ seconds?

Important Questions on Electrochemistry

Learn and Prepare for any exam you want !

Define equivalent and molar conductance. Give their relationship with specific conductance. How does equivalent conductance vary with increase in temperature? How many atoms of calcium will be deposited from fused CaCl2 by a current of 25 milliamperes passes for 60 seconds?

Important Questions on Electrochemistry

Learn and Prepare for any exam you want !

Define equivalent and molar conductance. Give their relationship with specific conductance. How does equivalent conductance vary with increase in temperature?

How many atoms of calcium will be deposited from fused ${CaCl}_{2}$ by a current of $25$ milliamperes passes for $60$ seconds?