Kohlrausch's law can be used to determine (a) \(\lambda_{\infty}\) for weak electrolyte (b) absolute ionic mobilities (c) solubility of a sparingly soluble salt (d) all of these

Short Answer

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Kohlrausch's law can be used to determine (a) \(\lambda_{\infty}\) for weak electrolyte, (b) absolute ionic mobilities, (c) solubility of a sparingly soluble salt. Therefore, option (d) 'all of these' is the correct answer.

Step by step solution

01

Understanding Kohlrausch's law

Kohlrausch's law states that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation. It allows us to calculate the conductivity of weak electrolytes, absolute ionic mobilities, and solubility of sparingly soluble salts.
02

Calculate \(\lambda_{\infty}\) for weak electrolyte

Kohlrausch's law provides a way to calculate \(\lambda_{\infty}\) for a weak electrolyte, by summing the individual contributions of the anion and cation at infinite dilution. Hence, option (a) is correct.
03

Determine absolute ionic mobilities

The law enables the determination of absolute ionic mobilities due to the relationship between molar conductivity and mobility of ions. Ion mobility is expressed as speed per unit electrolyte field strength. Hence, option (b) is correct.
04

Determine the solubility of sparingly soluble salts

With the help of Kohlrausch's law, one can calculate the solubility of a sparingly soluble salt. When dissolved, these salts disassociate into their respective ions contributing to the conductivity. Hence, option (c) is correct.

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Most popular questions from this chapter

Which of the following postulatales of Debye-Huckel theory is/are true? (a) The strong electrolyte is completely ionised at all dilutions. (b) The oppositely changed ions are completely distributed in the solution but the cations tend to be found in the vicinity of anions and vice versa. (c) Decrease in equivalent conductance with increase in concentration is due to fall in mobilities of ions due to inter-ionic effect. (d) All of the above.

The equivalent conductance at infinite dilution of \(\mathrm{NaCl}\), \(\mathrm{HCl}\) and \(\mathrm{CH}_{3} \mathrm{COONa}\) at \(25^{\circ} \mathrm{C}\) are \(126.0\), \(426.0\) and \(91.0 \mathrm{ohm}^{-1} \mathrm{~cm}^{2}\) respectively. The equivalent conductance of acetic acid at infinite dilution at \(25^{\circ} \mathrm{C}\) will be (a) \(643.0\) (b) \(517.0\) (c) \(217.0\) (d) \(391.0\)

When a strong acid is titrated against a strong base, the end point is the point of (a) zero conductance (b) maximum conductance (c) minimum conductance (d) none of these.

Kohlrasch's law can be expressed as (a) \(\lambda_{\infty}=\lambda_{a}-\lambda_{c}\) (b) \(\lambda_{\infty}=\lambda_{c}-\lambda_{a}\) (c) \(\lambda_{\infty}=\lambda_{a}+\lambda_{c}\) (d) \(\lambda_{\infty}=\lambda_{c}+\lambda_{a}\)

On passing electrical current through an electrolyte solution, the cations (a) move towards cathode with speed equal to that of anions towards anode (b) move with faster speed than that of anions (c) move with different speed as compared to that of anions (d) move with slower speed than that of anions

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