At a temperature of 295 K, the experimentally determine

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At a temperature of 295 K, the experimentally determined surface tension of water is 72.2 mJ / m2, and a 0.1 molar solution of sodium oleic acid is 62 mJ / m2. Determine the adsorption of sodium oleic acid on the surface of the solution with a concentration of 0.05 mol / L. The answer is 2.08 * 10 ^ -6