How can limiting molar conductivity of weak and strong electrolytes be determined?
) for strong and weak elctrolyte can be determined by using Kohlrauch’s law which states that “the limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte.”
How does molar conductivity of strong and weak electrolyte vary with concentration?
Molar conductivity increases with decrease in concentration as the total volume, V, of a solution containing one mole of electrolyte also increases. Upon dilution, the concentration decreases. Variation of molar conductivity with concentration is different for strong and weak electrolytes.
Are strong or weak electrolytes more conductive?
A strong electrolyte is one where many ions are present in the solution and a weak electrolyte is one where few ions are present. Strong electrolytes are good conductors of electricity and weak electrolytes are weak conductors of electricity. Non-electrolytes do not conduct electricity at all.
How does the molar conductivity of a strong and a weak electrolyte vary with dilution give reasons for this variation?
The molar conductivity of both, strong and weak electrolytes increases with dilution or the decrease in concentration of the electrolytic solution. As the dilution increase , the dissociation of the electrolyte increases, hence the total number of ions increases, therefore, the molar conductivity increases.
How is Kohlrausch’s law helpful in finding out the limiting molar conductivity of a weak electrolyte?
Kohlrausch’s law states that the equivalent conductivity of an electrolyte at infinite dilution is equal to the sum of the conductances of the anions and cations. The molar conductivity of a solution increases with the decrease in concentration.
What is the effect of decreasing concentration on molar conductivity of weak electrolyte?
Molar conductivity increases with decrease in concentration for weak electrolytes.
Why does molar conductivity increase with decrease in concentration?
Change in Molar Conductivity Molar conductivity increases with a decrease in concentration. This happens because the total volume, V, of the solution containing one mole of electrolyte also increases. Upon dilution, the concentration decreases.
What is the difference between strong electrolyte and weak electrolyte?
Strong Electrolytes – Electrolytes are chemical species that, when dissolved in water, transmit electricity. Weak electrolytes – A weak electrolyte is an electrolyte that ionises very little in solution. Strong electrolytes are electrolytes that are entirely ionised. They have a high conductivity of electricity.
How can you tell the difference between strong and weak electrolytes?
Some electrolytes are strong compounds and others are weak electrolytes. The main difference between strong electrolytes and weak electrolytes is that strong electrolytes can almost completely dissociate into its ions whereas weak electrolytes partially dissociate into ions.
How is molar conductivity of a weak electrolyte at infinite dilution determined or state kohlrausch’s Law write two applications?
Why is the molar conductivity of strong electrolytes higher?
For strong electrolytes, the molar conductivity is higher than those of weak electrolyte at high concentrations. As the solutions become dilute, the molar conductivities also increase in the case of weak electrolytes but the variation is less steep than for weak electrolytes.
When does the molar conductivity of a solution reach zero?
When the concentration approaches zero, the molar conductivity of the solution is known as limiting molar conductivity, Ë°m. Variation of molar conductivity with concentration is different for strong and weak electrolytes.
How is the conductance of a weak electrolyte determined?
For weak electrolyte, the increase of molar conductivity with increasing dilution is ascribed to increased dissociation of the electrolyte molecules to free ions. However, a thermodynamic equilibrium exists between the un-dissociated molecules and the ions formed from dissociation.
How is the dissociation degree of an electrolyte determined?
The dissociation degree, α at the given concentration, C is given by. α = Λ / Λ o. where Λ o is the molar conductivity in the limit of zero concentration or limiting molar conductivity. For strong electrolytes, the molar conductivity is higher than those of weak electrolyte at high concentrations.