Homework Help: chemistry

Posted by Anonymouse one on Monday, February 21, 2011 at 11:15am.

for our lab, we are given the molarity of ClO-. We are then supposed to use beer's law to determine the molarity of the dye that was used to make the solution with. For the dye, use the first absorbance value, Ao, and calculate the initial concentration of the dye using Beer’s Law: A = abc, which can be rearranged to give [Dye] = Ao/ab with b = 1 cm and a= absorptivity = 0.164 L/mg-cm@630 nm. The first absorbance value reached was at 0 time and was 0.339. How should I set this up and what should I look for to make sure my answer isn't erroneous?

chemistry - DrBob222, Monday, February 21, 2011 at 4:28pm
Just plug in the numbers.
b = 1
Ao = 0.339
a = 0.164
Solve for (dye) = ?? which will be in what unit? (mg/L??)

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