If a solution has an absorbance value of 0.418 at a wavelength of 450 nm, what i

Question

If a solution has an absorbance value of 0.418 at a wavelength of 450 nm, what is the percent transmittance of this solution at this wavelength? How would a student make 500.0 ml. of a 0.05100 M solution of iron(III) using a stock solution that is 0.3180 M in iron(III)? Explain how this would be done. A student measures k for a certain blue dye to be 18.4 M^-1 at 560 nm. What is the molarity of the dye in a solution with an absorbance of 0.118 at this wavelength? If you did not wipe your fingerprints off from the cuvette before measuring absorbance in a spectrophotometer, what would you expect to happen to your absorbance reading? Explain your answer.

Explanation / Answer

Answer:

1. By using Beers law,

We know that,

A = 2 - log%T

Where, A - Absorbance, %T - Percent Transmittance

0.418 = 2 - log%T

log%T = 2 - 0.418

T = 38.194 %

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