anonymous
  • anonymous
Please help... A student in lab creates a Beer's Law calibration curve with the equation A=7.02M-1c. What is the concentration of the solution if the absorbance is 0.327?
Chemistry
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I don't know if I should use this equation which is given: A=7.02M-1c. Since the absorbance is 0.327, I put that in for (A) and we are looking for the concentration (c). 0.327=7.02M-1c 0.327/7.02M-1=7.02M-1c/7.02M-1 0.04658=0.0466
aaronq
  • aaronq
what does M stand for?
anonymous
  • anonymous
Molarity

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aaronq
  • aaronq
that is how you would solve it though. if M is molarity, then what is C?
anonymous
  • anonymous
concentration
aaronq
  • aaronq
but Molarity IS concentration.. why is there 2 units of concentration?
anonymous
  • anonymous
That is what was given to us.
anonymous
  • anonymous
I think my calculation is correct
aaronq
  • aaronq
i mean, the way you're solving it seems right, but i don't think M would stand for molarity, IF, C is concentration.
anonymous
  • anonymous
You are right. I'm guessing my units are in s-1
aaronq
  • aaronq
the answer can't be in units of 1/s, you're finding concentration :S
anonymous
  • anonymous
Could it be in grams?
aaronq
  • aaronq
could be in g/L but not just grams, thats a unit of mass not conc.
anonymous
  • anonymous
Thanks. I need to get it together for real. Thanks for the help and explanation.
aaronq
  • aaronq
no worries! good luck

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