The molar absorption coefficient of the dye sample at transmittance of 29 percent has to be calculated. The value of transmittance when the path length of cell is 2 .50 mm has to be calculated. Concept introduction: Absorbance is the amount of light absorbed by molecules. On passing light through a sample with incident intensity I o some amount of light is absorbed and some is transmitted. The intensity of transmitted light is I . The transmittance of sample is given as T = I I o . The absorbance of the sample is given as A = − log T . According to Beer-Lambert Law, the absorbance of species is linearly proportional to the concentration of absorbing species. Absorbance is given as A = ε [ J ] L .

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Chapter 11, Problem 11A.6BE

Interpretation Introduction

Interpretation:

The molar absorption coefficient of the dye sample at transmittance of 29 percent has to be calculated. The value of transmittance when the path length of cell is 2.50 mm has to be calculated.

Concept introduction:

Absorbance is the amount of light absorbed by molecules. On passing light through a sample with incident intensity Io some amount of light is absorbed and some is transmitted. The intensity of transmitted light is I. The transmittance of sample is given as T=IIo. The absorbance of the sample is given as A=−logT. According to Beer-Lambert Law, the absorbance of species is linearly proportional to the concentration of absorbing species. Absorbance is given as A=ε[J]L.

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