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Standard Addition Chemistry problem

  1. Apr 7, 2010 #1
    1. The problem statement, all variables and given/known data
    hw10.jpg


    2. Relevant equations
    Not completely sure, but I believe equation is:
    Cx = bCs/mVx
    cx = concentration of sample
    b= y-intercept
    cs= concentration of standard
    m=slope
    Vx=volume of sample


    3. The attempt at a solution
    I plotted the values on a graph with Absorbance on the Y-axis and [Pb] added on the X-axis, and put a trendline extending through the X axis. Eqn I came up with is y=.209x+2.211

    My teacher was very vague with standard addition and through searching the web it said the best way to figure out the initial concentration is through spiking the samples. I am really not sure where to else to go with this problem since my equation above has several variables that aren't given in the problem statement (volume, concentration of standard).
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 10, 2010 #2

    chemisttree

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    Well? X in this case represents the added lead in mg/mL. What would the value of y represent when x=0?
     
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