With the help of a graph explain why it is not possible to determine λ m ∞ for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte.

It is not possible to determine λ m ∞ (limiting molar conductivity) for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte. Because weak electrolyte dissociated to a much lesser extent as compared to a strong electrolyte. There is a large increase in conductance with dilution near the infinite dilution, it is due the concentration of the weak electrolyte is reduced.

With the help of a graph explain why it is not possible to determine λ m ∞ for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte.

It is not possible to determine λ m ∞ (limiting molar conductivity) for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte. Because weak electrolyte dissociated to a much lesser extent as compared to a strong electrolyte. There is a large increase in conductance with dilution near the infinite dilution, it is due the concentration of the weak electrolyte is reduced.

What is the molar conductivity of 0 · 1 M NaCl if its conductivity is 1 . 06 × 10 - 2 Ω - 1 cm - 1 ?

1 · 06 × 10 2 Ω - 1 cm 2 mol - 1

1 · 06 × 10 - 2 Ω - 1 cm 2 mol - 1

9 · 4 × 10 - 2 Ω - 1 cm 2 mol - 1

5 · 3 × 10 3 Ω - 1 cm 2 mol - 1

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With the help of a graph explain why it is not possible to determine $λ_{m}^{\infty}$ for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte.

Important Questions on Electrochemistry

HARD

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

The equation that is incorrect is:

HARD

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Which one of the following graphs between molar conductivity

(Λ_{m})

versus

\sqrt{C}

is correct?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Amongst the following, the form of water with the lowest ionic conductance at

298 K

is:

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

The variation of molar conductively with concentration of an electrolyte (X) in aqueous solution is shown in the given figure.

Question Image

The electrolyte X is :

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

The specific conductance

(K)

0 .02 M

aqueous acetic acid solution at

298 K

1 .65 \times 10^{- 4} S {cm}^{- 1} .

The degree of dissociation of acetic acid is

[Given: equivalent conductance at infinite dilution of

H^{+} = 349 .1 S {cm}^{2} {mol}^{- 1}

and

{CH}_{3} {COO}^{-} = 40 .9 S {cm}^{2} {mol}^{- 1}

]

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Let

C_{NaCl}

and

{C_{BaSO}}_{4}

, be the conductances (in S) measured for saturated aqueous solutions of

NaCl

and

B a S O_{4}

respectively, at a temperature T. Which of the following is false?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Consider the statements

S 1

and

S 2

S 1

: Conductivity always increases with decreases in the concentration of electrolyte.

S 2

: Molar conductivity always increases with decreases in the concentration of electrolyte.
The correct option among the following

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

An electrolyte of a polymer-salt complex of poly (ethylene oxide) -

{LiCF}_{3} {SO}_{3}

is shaped into a free standing circular film of

20 mm

diameter and a thickness of

20 μ m .

When it is sandwiched between 2 stainless steel circular electrodes of the same diameter, this cell exhibits a conductance of

\frac{314}{5} S .

What is the specific conductivity of the electrolyte?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

If the molar conductivities

(in S {cm}^{2} {mol}^{- 1})

NaCl, KCl and NaOH

at infinite dilution are 126 and 150 and 250 respectively, the molar conductivity of

KOH (in S {cm}^{2} {mol}^{- 1})

is -

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

The molar conductivities of

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

and

{CH}_{3} COONa

at infinite dilution follow the order

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

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>Conductance in Electrolytic Solutions

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 :

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

What is the common unit of conductivity if the dimensions are expressed in centimeter?

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Which of the following electrolytic solution has the least specific conductance

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

What is the molar conductivity of

0 \cdot 1 M NaCl

if its conductivity is

1.06 \times 10^{- 2} Ω^{- 1} {cm}^{- 1}

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

0.002 M

solution of a weak acid has an equivalent conductance

(Λ) 60 {ohm}^{- 1} {cm}^{2}

{eq}^{- 1}

. What will be the

pH

? (Given :

Λ ° = 400 {ohm}^{- 1} {cm}^{2} {eq}^{- 1}

]

HARD

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

Among the following, the plot that correctly represents the conductometric titration of

0.05 M

H_{2} {SO}_{4}

with

0.1 M {NH}_{4} OH

EASY

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

The decreasing order of electrical conductivity of the following aqueous solutions is:

(A)

0.1 M

Formic acid,

(B)

0.1 M

Acetic acid,

(C)

0.1 M

Benzoic acid.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Conductance in Electrolytic Solutions

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>Conductance in Electrolytic Solutions

The resistance of

0 .01 N

solution of an electrolyte was found to be

220 ohm

298 K

using a conductivity cell with a cell constant of

0.88 cm^{- 1}

. The value of equivalent conductance of solution is-

With the help of a graph explain why it is not possible to determine λm∞ for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte.

Important Questions on Electrochemistry

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With the help of a graph explain why it is not possible to determine $λ_{m}^{\infty}$ for a weak electrolyte by extrapolating the concentration-molar conductance curve as for strong electrolyte.