1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Potentiometric titration by ''mathematica''

  1. Nov 14, 2012 #1
    1. The problem statement, all variables and given/known data

    at first, please look at this link

    as you know, potentiometric titration's data makes this graph.

    and first derivative, 2nd derivative etc..

    I haven't tried this experiment yet.
    So I'd like to try this by the data which I just make by myself.
    this is not my real data.

    data = {{0, 1.0}, {2.5, 1.2}, {5.0, 1.3}, {7.5, 1.5}, {10.0,
    1.7}, {12.5, 2.0}, {15.0, 7.0}, {17.5, 11.9}, {20.0, 12.1}, {22.5,
    12.3}, {25.0, 12.4}, {27.5, 12.5}, {30.0, 12.5}}

    2. Relevant equations

    3. The attempt at a solution

    1. I plotted the data.

    2. and I used interpolation.

    3. I plotted the graph
    Plot[f[x], {x, 0, 30}]

    there is a problem. If you try this, you would find out, near the end point, it doesnt fit well.
    I want the graph just like the link as I mentioned first

    well.. I know that I can draw these graph by my hand by the excel.
    just write the data,
    plot the graph,
    and I find dy/dx one by one
    and draw the 1st derivative graph,
    and d2y/dx2 one by one..


    as you know,
    I think this stupid doing is not good

    So I just want to plot the data easily by the mathematica..

    is there any way to draw the data easily?
    or just I have to plot the graph one by one?

    please help me..
  2. jcsd
  3. Nov 14, 2012 #2


    User Avatar

    Staff: Mentor

    Try to use more data points, and make them more dense around the important places.

    Not trhat I know it will work, just guessing.
  4. Nov 14, 2012 #3
    dear borek

    then could you help me plot the 1st derivative graph?
  5. Nov 14, 2012 #4
    well I got it

    but I don't know how to delete this post

    I'll figure it out

    wait a sec..
  6. Nov 14, 2012 #5

    is there anyone who can tell me how to delete this post?

  7. Nov 14, 2012 #6


    User Avatar

    Staff: Mentor

    Edit -> delete

    But the edit courtesy time is limited.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook