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Beer's Law slope

  1. Feb 5, 2010 #1
    1. The problem statement, all variables and given/known data
    I made a graph of Absorbance vs. Concentration from data I got in the lab.
    I graphed it and now am trying to figure out how to find the slope of the curve.
    It's supposed to be a Beer's Law calibration curve.

    2. Relevant equations

    3. The attempt at a solution
    I used Excel and got y = 228.19x + .0369 as the trendline.
    Would 228.19 be the Beer's Law slope I need to use to find the concentrations of other absorbances later in the lab? It seems too high, but I really need feedback fast, please. Thank you.
  2. jcsd
  3. Feb 8, 2010 #2


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    Science Advisor
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    Gold Member

    Yes, it's the slope. Make sure you have chosen x and y correctly, though.
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