Following experimental data is obtained for the osmotic pressure of the solution by adding different moles of C₁₇H₃₅COONa in sufficient water to get 1.0 l solution in each case: Moles of C₁₇H₃₅COONa:

Question

Following experimental data is obtained for the osmotic pressure of the solution by adding different moles of C₁₇H₃₅COONa in sufficient water to get 1.0 l solution in each case: Moles of C₁₇H₃₅COONa: 0, 0.01, 0.02, 0.03, 0.04. π/RT (moles/litre): 0, 0.02, 0.04, 0.058, 0.076. Select the correct information(s) regarding the nature of solution

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. The value of π/RT equals the effective molarity (i × C). Up to 0.02 M, the factor is 2 (e.g., 0.02 × 2 = 0.04), indicating complete dissociation as a true strong electrolyte solution. At 0.03 M and 0.04 M, the value drops below the expected 2C (0.058 < 0.060), showing association into micelles (colloidal solution). The change starts between 0.02 M and 0.03 M, placing the CMC there. Micelles create a heterogeneous colloidal system, making D incorrect. Therefore, correct answer is A,B,C.

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