2-naphthol benzoic acid sodium benzoate ethyl p-aminobenzoate biphenyl H2N. OH Na 2.70 1.87 -2.27 1.86 4.01 Figure 1. octanol-water partition coefficients log10Poctanol water for organic compounds We can use this to calculate the distribution of a compound between the two phases. For example, take 2-naphthol: the value of log 10P for this compound is calculated to be 2.70. [2 – naphthol]octanol [2-naphthol]water 102.70 = 5.0 × 10² The percentage of 2-naphthol in water is given by: [2-naphthol]water [2-naphthol]octanol + [2-naphthol]water %[2-naphthol],water = 100 ×

2-naphthol benzoic acid sodium benzoate ethyl p-aminobenzoate biphenyl H2N. OH Na 2.70 1.87 -2.27 1.86 4.01 Figure 1. octanol-water partition coefficients log10Poctanol water for organic compounds We can use this to calculate the distribution of a compound between the two phases. For example, take 2-naphthol: the value of log 10P for this compound is calculated to be 2.70. [2 – naphthol]octanol [2-naphthol]water 102.70 = 5.0 × 10² The percentage of 2-naphthol in water is given by: [2-naphthol]water [2-naphthol]octanol + [2-naphthol]water %[2-naphthol],water = 100 ×

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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Question

2-naphthol
benzoic acid
sodium benzoate
ethyl p-aminobenzoate
biphenyl
H2N.
Na
2.70
1.87
-2.27
1.86
4.01
Figure 1. octanol-water partition coefficients log1,Poctanol water for organic compounds
We can use this to calculate the distribution of a compound between the two phases. For
example, take 2-naphthol: the value of log 10P for this compound is calculated to be 2.70.
[2 – naphthol]octanol
[2-naphthol]water
102.70 = 5.0 × 10²
The percentage of 2-naphthol in water is given by:
[2-naphthol]water
[2-naphthol]octanol + [2-naphthol]water
%[2-naphthol],water = 100 x
Assuming partition between equal volumes of organic and aqueous phase, what percentage of
each of the compounds will be present in the water layer (show working)?
Benzoic acid
Ethyl p-aminobenzoate
Biphenyl

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