The conductivity of 0 . 10 M solution of KCl at 298 K is 0 . 0129 S cm - 1 . Calculate its molar conductivity.

Given: The concentration of the solution = 0 . 10 M The conductivity of the solution k = 0 . 0129 S cm - 1 = 1 . 29 × 10 - 2 ohm - 1 cm - 1 Molar conductivity, ∧ m = k × 1000 M ohm - 1 cm 2 mol - 1 = 1 . 29 × 10 - 2 × 1000 0 . 10 ohm - 1 cm 2 mol - 1 = 129 ohm - 1 cm 2 mol - 1

The molar conductivity of 0 . 05 M BaCl 2 solution at 25 ° C is 223 Ω - 1 cm 2 mol - 1 . What is its conductivity?

Given, Concentration ( C ) = 0 . 05 M Molar conductivity ( λ m ) = 223 Ω - 1 cm 2 mol - 1 As we know, Molar conductivity, λ m = 1000 × k C ⋯ ⋯ ⋯ ⋯ ( i ) ∴ k = λ m × C 1000 ⋯ ⋯ ⋯ ⋯ ⋯ ( ii ) Put all the values in equation ii , = 223 × 0 . 05 1000 = 0 . 01115 S cm - 1 or Ω - 1 cm - 1 Therefore, the molar conductivity of BaCl 2 solution is 0 . 01115 S cm - 1 or Ω - 1 cm - 1 .

Match List - I with List - II : List - I (Parameter) List - II (Unit) (a) Cell constant (i) S cm 2 mol - 1 (b) Molar conductivity (ii) Dimensionless (c) Conductivity (iii) m - 1 (d) Degree of dissociation of electrolyte (iv) Ω - 1 m - 1

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

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List the points of difference between metallic conductor and electrolytic conductor.

Important Questions on Electrochemistry

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The molar conductivities of

HCl, NaCl, {CH}_{3} COOH

and

{CH}_{3} COONa

at infinite dilution follow the order

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

291 K

, saturated solution of

{BaSO}_{4}

was found to have a specific conductivity of

3.648 \times 10^{- 6} {ohm}^{- 1} {cm}^{- 1}

and that of water being used is

1.25 \times 10^{- 6} {ohm}^{- 1} {cm}^{- 1}

. If the ionic conductance's of

{Ba}^{2 +}

and

{SO}_{4}^{2 -}

are

110

and

136.6 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}

respectively, the solubility of

{BaSO}_{4}

291 K

will be [Atomic masses of

Ba - 137, S - 32, 0 - 16]

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

In the plot of molar conductivity $(\land_{m})$ vs square root of concentration $(c^{1 / 2})$ , following curves are obtained for two electrolytes A and B :

Question Image

Answer the following :
Predict the nature of electrolytes A and B.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Define the equivalent conductivity.

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The pair of electrolytes that possess same value for the constant

(A)

in the Debye - Huckel - Onsagar equation,

λ_{m} = λ_{m} ° - A \sqrt{C}

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The specific conductivity of a solution containing

5

g of anhydrous

{BaCl}_{2}

( molecular weight

= 208

) in

1000 {cm}^{3}

of a solution is found to be

0.0058 {ohm}^{- 1} {cm}^{- 1}

. Calculate the molar and equivalent conductivity of the solution.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The resistance of conductivity cell with cell constant

1.14 {cm}^{- 1}

, containing

0.001 M KCl

298 K

1500 Ω

. The molar conductivity of

0.001 M KCl

solution at

298 K

S {cm}^{2} {mol}^{- 1}

is (Integer answer)

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The conductivity of

0.10 M

solution of

KCl

298 K

0.0129 S {cm}^{- 1}

. Calculate its molar conductivity.

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The graph of

\sqrt{C} vs \land_{m}

for an aqueous solution of which substance is not obtained as a straight line?

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Given below are two statements:
Statement I : The limiting molar conductivity of $KCl$ (strong electrolyte) is higher compared to that of $\mathrm{CH}_{3} \mathrm{COOH}$ (weak electrolyte).
Statement II : Molar conductivity decreases with decrease in concentration of electrolyte.

In the light of the above statements, choose the most appropriate answer from the options given below:

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

State Kohlrausch law of independent migration of ions. Write an expression for the molar conductivity of acetic acid at infinite dilution according to Kohlrausch. law.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Give a reason for the following.
Conductivity of dilute hydrochloric acid is greater than that of acetic acid.

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Define molar conductivity of a solution. Explain how molar conductivity changes with change in concentration of solution for a weak and a strong electrolyte.

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The molar conductivity of a

0.5 mol {dm}^{- 3}

solution of

A g N O_{3}

with electrolytic conductivity of

5.76 \times 10^{- 3} S c m^{- 1}

298 K

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

The molar conductivity of

0.05 M {BaCl}_{2}

solution at

25 ° C

223 Ω^{- 1} {cm}^{2} {mol}^{- 1}

. What is its conductivity?

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Define the following and write the formula and unit :

Equivalent conductivity

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Distinguish between electronic conduction and electrolytic conduction.

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Match List - I with List - II :

	List - I (Parameter)		List - II (Unit)
(a)	Cell constant	(i)	$S {cm}^{2} {mol}^{- 1}$
(b)	Molar conductivity	(ii)	Dimensionless
(c)	Conductivity	(iii)	$m^{- 1}$
(d)	Degree of dissociation of electrolyte	(iv)	$Ω^{- 1} m^{- 1}$

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Which one of the following graphs between molar conductivity

(Λ_{m})

versus

\sqrt{C}

is correct?

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic and Metallic Conduction

Resistance of 0.2 M solution of an electrolyte is

50 Ω

. The specific conductance of the solution is

{1.4 S m}^{-1}

. The resistance of 0.5 M solution of the same electrolyte is

280 Ω

. The molar conductivity of 0.5 M solution of the electrolyte in

{S m}^{2} {mol}^{-1}

is :

List the points of difference between metallic conductor and electrolytic conductor.

Important Questions on Electrochemistry

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