1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Beer lambert law

  1. Oct 5, 2009 #1
    1. The problem statement, all variables and given/known data
    The p-nitrophenolate ion absorbs lights at 405nm. A solution that is 74um in the p-nitrophenolate ion was diluted 1 in 2 with water.Absorbance of resulting solution at 405nm was .650. Calculate molar extinction coefficient of the p-nitrophenolate ion at 405nm. Your meant to assume water has no absorbance at 405 nm.

    How do you use the beer lambert law to predict the absorbance at 405nm of a solution that is 11.0mM in the p-nitrophenolate ion, how do you show absorbance has no units


    2. Relevant equations
    A=ecl


    3. The attempt at a solution

    .650 = e x 1 x (74/2)??
    dont think im right at all...
     
  2. jcsd
  3. Oct 5, 2009 #2

    Ygggdrasil

    User Avatar
    Science Advisor

    That's the correct way to setup the equation, but you should include units so that you can get the units of ε correct (ε is usually reported in units of L cm-1 mol-1).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Beer lambert law
  1. Beer-Lambert equation (Replies: 3)

  2. Beer lambert ques (Replies: 8)

Loading...