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Calculate the surface adsorption I' for a 0.100M solution of caproic acid. Give your answer in SI units. Assume T=298K.

Calculate the surface adsorption I' for a 0.100M solution of caproic acid. Give your answer in SI units. Assume T=298K.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Surfactants are amphilic molecules (i.e. part polar and part non-polar). When dissolved water a certain fraction of the amphilic molecules form a surface monolayer, where the polar part of the molecule is directed inward toward the water and the nonpolar part of the molecule is directed outward away from the water. Surfactants have the effect of lowering the surface tension of the solution. Fatty acids are organic acids composed of acpolar carboxyl head group and a nonpolr aliphatic chain. If a solution of a fatty acid has a bulk concentration of c₂ the surfact tension of this solution is related to the surface tension f pure water yo by yo y = ax ln(1 + bx c₂) where a and b are constants. ▼ Part A For the fatty acid caproic acid the constants a and b are a = 0.0130 and b= 232.7. Calculate the surface tension of a 0.100M solution of caproic acid. Assume at T=298K the surface tension of pure water is = 0.07199. Give your answer in SI units. 7 = 3.05x10-2 N m Submit Previous Answers ✓ Correct Part B Calculate the surface adsorption I' for a 0.100M solution of caproic acid. Give your answer i SI units. Assume T-298K. r = Submit ——| ΑΣΦ Request Answer mor m²
Transcribed Image Text:Surfactants are amphilic molecules (i.e. part polar and part non-polar). When dissolved water a certain fraction of the amphilic molecules form a surface monolayer, where the polar part of the molecule is directed inward toward the water and the nonpolar part of the molecule is directed outward away from the water. Surfactants have the effect of lowering the surface tension of the solution. Fatty acids are organic acids composed of acpolar carboxyl head group and a nonpolr aliphatic chain. If a solution of a fatty acid has a bulk concentration of c₂ the surfact tension of this solution is related to the surface tension f pure water yo by yo y = ax ln(1 + bx c₂) where a and b are constants. ▼ Part A For the fatty acid caproic acid the constants a and b are a = 0.0130 and b= 232.7. Calculate the surface tension of a 0.100M solution of caproic acid. Assume at T=298K the surface tension of pure water is = 0.07199. Give your answer in SI units. 7 = 3.05x10-2 N m Submit Previous Answers ✓ Correct Part B Calculate the surface adsorption I' for a 0.100M solution of caproic acid. Give your answer i SI units. Assume T-298K. r = Submit ——| ΑΣΦ Request Answer mor m²
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