Electrochemistry Concepts

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Questions and Answers

Given specific conductance K, resistance R, distance l, and cross-sectional area A, what is the specific resistance?

$\frac{1000 \times K}{R \times A}$
$\frac{R \times A}{l}$ (correct)
$\frac{l}{RA}$
$\frac{R \times A}{1000 \times K}$

What is equal to $\frac{1}{R \times A}$?

$\frac{R \times l}{A}$
$\frac{1}{R A}$ (correct)
$\frac{1}{\lambda}$
$\frac{R}{A \times l}$

How is molar conductivity calculated?

$\frac{1000 \times K}{C}$ (correct)
$\frac{K}{C \times 1000}$
$\frac{K}{C}$
$\frac{1000}{K \times C}$

What is the cell constant?

$\frac{1}{K}$ (C) Signup and view all the answers

For an electrolyte with v = 1 such as NaCl, how does molar conductivity ((\lambda)) relate to concentration (C)?

$\lambda \propto \frac{1}{\sqrt{C}}$ (D) Signup and view all the answers

Which state of NaCl is a non-conductor of electricity?

NaCl(s) (B) Signup and view all the answers

To obtain the cell constant, the resistance of a solution is multiplied by which of the following?

Specific conductance (K) (C) Signup and view all the answers

When an electrolyte solution is diluted, what causes the increase in equivalent conductance?

Increase in ionization of electrolyte (C) Signup and view all the answers

Flashcards

Specific Resistance

The specific resistance is the resistance of a conductor of unit length and unit cross-sectional area. It is the reciprocal of specific conductance (κ).

Molar Conductivity

Molar conductivity is the conductivity of a solution containing 1 mole of electrolyte dissolved in 1 L of solution. It's calculated by dividing specific conductance (κ) by the molar concentration (C).

Cell Constant

Cell constant is a characteristic of the conductivity cell. It's the ratio of the distance between the electrodes (l) to the cross-sectional area (A).

Equivalent Conductance

Equivalent conductance is the conductivity of a solution containing one gram equivalent of the electrolyte when dissolved in 1 L of solution. It's calculated by dividing the molar conductivity by the number of ions produced per formula unit.

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Increase in Equivalent Conductance

The conductivity of a solution increases with dilution due to the increase in the number of ions present per unit volume. This is because the electrolyte ionizes further in a diluted solution.

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