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Chapter 19: Q13P (page 487)

Iodine reacts with mesitylene to form a complex with an absorption maximum at 332 nm in CCl4 solution:

(b)Spectrophotometric data for this reaction are shown in the table.Because[mesitylene]tot>>[I2],we can say that [mesitylene]鈮�[mesitylene]tot. Prepare a graph ofA/([mesitylene][I2]tot)versusA/[I2]totand find the equilibrium constant and molar absorptivity of the complex.

Short Answer

Expert verified

The equilibrium constant is 0.464 and molar absorptivity is 1.074鈰�104M-1cm-1.

Step by step solution

01

Define molar absorptivity.

It is measurement of how strongly a chemical species absorbs light at a given wavelength.

02

Draw a graph.

03

Calculate equilibrium constant.

From the graph, slope is -0.464. The slope is 鈥揔.

So, K = 0.464.

Using function of intercept, we calculate y- intercept.

So, the intercept is 4.984 .103

04

Calculate molar absorptivity.

O'=y-interceptKo'=4.984.1030.464o'=1.074.104M-1cm-1

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Most popular questions from this chapter

This problem can be worked by calculator or with the spreadsheet in Figure 19-4. Consider compounds X and Y in the example labeled 鈥淎nalysis of a Mixture, Using Equations 19-6鈥� on page 464. Find [X] and [Y] in a solution whose absorbance is 0.233 at 272 nm and 0.200 at 327 nm in a 0.100-cm cell.

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laser and measures fluorescence from each particle as it flows past the detector.

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2. The beads are incubated with a fluorescent derivative of TNT to saturate the antibodies, and excess TNT derivative is removed. The beads are resuspended in aqueous detergent.

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