Four solutions of various electrolytes are given along with their percent ionization: (I) 0.1 M NaCl (aq.) (90 % ionized) (II) 0.05 M CaCl 2 (aq.) ( 80% ionized) (III) 0.04 M K 3 [ Fe ( CN ) 6 ]

Question

Four solutions of various electrolytes are given along with their percent ionization:

(I) 0.1 M NaCl (aq.) (90 % ionized)

(II) $0.05 M CaCl_{2}$ (aq.) ( $80%$ ionized)

(III) $0.04 M K_{3} [Fe (CN)_{6}]$ (aq.) (60% ionized)

(IV) $0.03 MFeCl_{3}$ (aq.) (70% ionized)

Identify correct statement(s) assuming all solutions to be dilute:

TestHub · Accepted Answer

Explanation Question: Identify correct statement(s).

Concept: This question is based on freezing point and vapour pressure.

Solution:

(I) $i = 1 + (n - 1) α = 1 + (2 - 1) \times 0.9 = 1.9$

(II) $i = 1 + (3 - 1) \times 0.8 = 2.6$

(III) $i = 1 + (4 - 1) \times 0.6 = 2.8$

(IV) $i = 1 + (4 - 1) \times 0.7 = 3.1$

Colligative property $= i \times$ concentration

(I) $i \times$ concentration $= 0.1 \times 1.9 = 0.19$

(II) $i \times$ concentration $= 0.05 \times 2.6 = 0.13$

(III) $i \times$ concentration $= 0.04 \times 2.8 = 0.112$

(IV) $i \times$ concentration $= 0.03 \times 3.1 = 0.093$

vapour pressure is highest for lowest $i \times$ concentration

freezing point is highest for lowest $i \times$ concentration

Boiling point is highest for highest $i \times$ concentration

Chemistry - Liquid Solution Question with Solution | TestHub