Acetic acid associates as dimers in benzene. What is the Van’t Hoff factor (i) if the degree of association of acetic acid is 50%?(a) 0.25(b) 0.50(c) 0.75(d) 0.40I had been asked this question at a job interview.Query is from Abnormal Molar Masses topic in section Solutions of Chemistry – Class 12

Acetic acid associates as dimers in benzene. What is the Van’t Hoff

1.	Acetic acid associates as dimers in benzene. What is the Van’t Hoff factor (i) if the degree of association of acetic acid is 50%?(a) 0.25(b) 0.50(c) 0.75(d) 0.40I had been asked this question at a job interview.Query is from Abnormal Molar Masses topic in section Solutions of Chemistry – Class 12
Answer» Correct option is (C) 0.75 Explanation: Given, Degree of association (α) = 50% = 0.5 Number of molecules ASSOCIATED (n) = 2 Let the Van’t Hoff factor = i We KNOW that for solutes that associate in SOLUTION, i = 1 + ((1/n) -1) x α = 1 + ((1/2) – 1) x 0.5 = 1 – (0.5 x 0.5) = 0.75 Therefore, the Van’t Hoff factor is equal to 0.75.

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