Answer to Question #92170 in Physical Chemistry for Ummulkhairi

Question

The equivalent conductance of sodium acetate,hydrochloric acid and sodium chloride at infinite dilution is 97.0, 426.16 and 126.45 ohms^-1 respectively at 25°C .calculate the equivalent conductance at infinite dilution for acetic acid

Answer 1

The electrolytes at infinite dilution will dissociate into following ions.

Sodium Acetate = Na⁺ + CH₃COO^- (1)

Hydrochloric Acid = H⁺+ Cl^- (2)

Sodium Chloride = Na⁺ + Cl^- (3)

We need to get the value for actetic acid which dissociates as follows

Acetic Acid = CH₃COO^- + H⁺

The above equation can come if we calculate (1)+(2)-(3) with the respective equivalent conductance's which yields

97+426.16-126.45 = 396.71 Ohms^-1