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Standard Additions plotting in excel

  1. Mar 8, 2014 #1
    1. The problem statement, all variables and given/known data

    I have a set of values from a laboratory work (standard Additions practical), which I am required to plot. I am finding difficulties in plotting the values in excel because the horizontal axis must have some negative integers.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 8, 2014 #2

    Borek

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    Staff: Mentor

    No idea what your problem is, last time I used it, Excel supported negative numbers.
     
  4. Mar 8, 2014 #3

    phinds

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    Gold Member
    2016 Award

    Have to agree w/ Borek. Can't see what your problem is

    attachment.php?attachmentid=67427&stc=1&d=1394317262.jpg
     

    Attached Files:

  5. Mar 9, 2014 #4
    Standard Additions

    Hello Borek,
    My problem is that I don't know how to make such plots in excel. As you might be aware, there is the need to extrapolate the calibration line backwards so as to obtain a negative value on the X-axis. This is what I cannot do and will appreciate it if someone could help me.
    The example given below is of no help as it looks nothing like a standard additions plot.

    Thanks.
     
  6. Mar 9, 2014 #5
    Have you plotted your data and fit a line already and don't know how to extrapolate or do you not know how to plot and fit data?
     
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