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.

Question

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.

Canvas Classes · Accepted Answer

Strategy:
 For weak acids of the same concentration, conductivity is proportional to the number of ions, which depends on the acid dissociation constant (). Higher  \implies higher \degree of dissociation.

Comparison of Acid Strengths:
1. Formic acid (A): The strongest among the three due to lack of bulky/donating groups. (Highest )
2. Benzoic acid (C): Intermediate strength.
3. Acetic acid (B): Weakest among the three because the  group is +I (inductive) and reduces acidity. (Lowest )

Order o

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