The absorbance of a of 4.5 times 10^-5 M Fe^2+ solution is measured as follows:

Question

The absorbance of a of 4.5 times 10^-5 M Fe^2+ solution is measured as follows: epsilon = 4325 L/mol.cm; cuvette ("cell") path length = 0.10 cm. The percent transmittance of the solution is 95.6%, which is hard to measure because so little light is absorbed. a) What is the absorbance of this solution? b) There are a couple of strategies that an analytical chemist can use to increase the absorbance and make this a better analysis. Briefly describe one and specify which term in Beer's law it alters.

Explanation / Answer

First,

A = e*l*C

A = 2- log(T%)

a)

find A for this solution

A = 2- log(95.6)

A = 0.019542

this is more reliable:

A = e*l*C

A =(4325*1)(4.5*10^-5 = 0.19462

since light is not well abosrbed,

b)

We can increase Absorbance by dilution, or using different concentration in order to shift beer's law statements

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