An aqueous solution containing 0.25 moles of a non-volatile but strong electrolyte solute 'X' in 500 g water freezes at -2.79°C. The number of ions furnished in water per formula unit of 'X' is ( = 1.

Question

An aqueous solution containing 0.25 moles of a non-volatile but strong electrolyte solute 'X' in 500 g water freezes at -2.79°C. The number of ions furnished in water per formula unit of 'X' is ($K_f$ = 1.86)

Prashant Kotian · Accepted Answer

Correct answer: C. Molality m = 0.25 / 0.500 = 0.50 m. i = ΔT_f / ( * m) = 2.79 / (1.86 * 0.50) = 3. Since the solute is completely dissociated, number of ions per formula unit = i = 3.

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