To prepare for this experiment: Prepare appropriate data tables for procedures A

Question

To prepare for this experiment: Prepare appropriate data tables for procedures A-D to collect your data in your laboratory notebook. Include titles, column headings and proper units. otometry: http:/len.wikipedia.org/wiki/Ultraviolet-visible spectroscopy Prelaboratory Assignment A solution is labeled 512 ppm. The solution is made with a solute that has molar mass equal to 338 g/mol. Using the graph on the previous page, answer the following two questions: Label your answer and give the correct number of significant figures. Write your answers in complete sentences, like you are reporting your results to a journal or at a scientific conference. I. What is the molarity of the solution? 2. a. What is the concentration (in ppm) of a solution with an absorbance of 0.425? What would you expect the absorbance to be for a solution with a concentration of 575 ppm? b.

Explanation / Answer

Q1.

recall that

ppm = mg of solute / Liter of solvent

then...

512 mg of species --> mol = mass/MW = (512*10^-3)/(338) = 0.001515 mol

Then

M = mol/V= 0.001515 / 1= 0.001515 M

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