i. (is pts) Calculate the solution concentration (c) of a compound whose molar a

Question

i. (is pts) Calculate the solution concentration (c) of a compound whose molar a The solution has an absorbance of 1.75 using a cell with a path length of 1.25 cm. bsorptivity(c) is 4575 M-1cm 57 18,75 57/8.7S 2. (15 pts) Consider "peaks" A and B on the UV-Vis spectrum below of an unknown compound dissolved in cyclohexane. One is 2,max of the unknown compound and the other is not. Which is Amax? Explain what caused the other absorbance. B is themax . A is caused by the 0 15 100 25o 00 400 4s0 $00 0 0so 700 I nte) Circle the com no und in each nair below that ulAuld

Explanation / Answer

UV spectra

The above shown UV spectrum for the unknown shows two peaks, peak B for the compound and lower wavelength peak A for the the coloring impurity in cyclohexane or the cuvette absorbance alone. It is much weaker then the compound absorbance peak.

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