The correct relation which depicts the Debye-Huckel Onsager Theory for...
Correct Answer :- B
Explanation : The Debye-Huckel was proposed by Peter Debye and Erich Huckel as a theoretical explanation for departure from ideality in solutions of electrolytes.
further modified by Lars Onsager in 1927.
Onsagar was able to derive a theoretical expression to account for the empirical relation known as Kohlrausch's law for the molar conductivity, Am
Am = Amo - K(c)½
For stronger electrolytes
Am = Amo - (A + BAmo)(c)1/2ac
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The correct relation which depicts the Debye-Huckel Onsager Theory for...
Debye-Huckel Onsager Theory for Strong Electrolytes:
The Debye-Huckel Onsager Theory is a theoretical explanation of the behavior of strong electrolytes in solution. It describes the relationship between the activity coefficient (Am) of an electrolyte and its concentration (c). The correct relation for this theory is given by the equation:
Am = Amo - (A + BAmo)(c)^(1/2)ac
Explanation:
- Am: Activity coefficient of the electrolyte
- Amo: Limiting activity coefficient of the electrolyte at infinite dilution
- A, B: Constants
- c: Concentration of the electrolyte
- a: Ion size parameter
Key points:
- The activity coefficient (Am) of a strong electrolyte decreases with an increase in concentration (c).
- The presence of ions in solution affects the activity coefficients of the electrolyte.
- The Debye-Huckel Onsager Theory takes into account the effect of ion size and concentration on the activity coefficient.
In the given relation, the activity coefficient (Am) is related to the limiting activity coefficient at infinite dilution (Amo), the constants A and B, the concentration (c), and the ion size parameter (a). The presence of the square root term in the equation accounts for the non-ideality of strong electrolytes in solution.
Overall, the Debye-Huckel Onsager Theory provides a theoretical basis for understanding the behavior of strong electrolytes in solution and the factors that influence their activity coefficients.