The complex formed between Cu(l) and 1, 10-phenanthroline has a molar absorptivi

Question

The complex formed between Cu(l) and 1, 10-phenanthroline has a molar absorptivity of 7.00. L mol^-1 cm^-1 at a wavelength 435 nm, the wavelength of maximum absorption. Showing all work for each part, calculate: the absorbance of an 8.50 times 10^-5 M solution of the complex when measured in a 1 00 cm cell at 435 nm. the percent transmittance of the solution in part (a) the concentration of a solution that has the same absorbance as the solution in part (a) when measured in a 5.00 cm cell. the path length through a 3.40 times 10^-5 M solution of me complex that to needed to have an absorbance that is the same as the solution in part (a)

Explanation / Answer

(A)

According to Beer's law,

A = e*l*c

Putting values,

A = 7 * 1 * 8.5*10-5 = 0.000595

(B)

A = 2 - log(%T)

Thus, log(%T) = 1.999405

So, %T = 101.999405 = 99.863 %

(C)

Putting values,

0.000595 = 7 * 5 * c

Thus, c = 1.7*10-5 M

(D)

Putting values,

0.000595 = 7 * l * 3.4*10-5

Thus, l = 2.5 cm

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