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roselin Group Title

what does the following mean? Calculate single ion activity coefficients for Cs^+, Cd^2+,Al^3+ and dissolved H2CO3 as a function of ionic strength for 10^-4 lessthan equal I lessthan equal to1?

  • 10 months ago
  • 10 months ago

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  1. aaronq Group Title
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    they want the activity coefficients for the different ions considering the ionic strength given

    • 10 months ago
  2. roselin Group Title
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    so from 10^-4 to 1?

    • 10 months ago
  3. roselin Group Title
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    i am using the davies equation to calculate it, so each time I have to change the ionic strength th?

    • 10 months ago
  4. aaronq Group Title
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    hm no that doesn't seem right. i don't know what they mean by \(10^{-4} \leq 1\), it doesn't make sense.

    • 10 months ago
  5. roselin Group Title
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    its \[10^{-4}\le I \le1\]

    • 10 months ago
  6. aaronq Group Title
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    oh, i thought you typed the same thing twice accidentally. I guess they want it within that range? thats a large range though. I would graph it

    • 10 months ago
  7. aaronq Group Title
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    on excel of course

    • 10 months ago
  8. roselin Group Title
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    we have to calculate and plot it

    • 10 months ago
  9. aaronq Group Title
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    i guess do a few points for each ion and then plot it

    • 10 months ago
  10. roselin Group Title
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    can I show you the full question ? please tell me what I should do

    • 10 months ago
  11. aaronq Group Title
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    plug it into the formula? \(log\;\gamma=0.5Z^+_0Z^-_0.. etc\) it's kinda weird though because they don't give you the negative counter ion

    • 10 months ago
  12. roselin Group Title
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    if I were to do this manually using that given range, how would I approach it?

    • 10 months ago
  13. aaronq Group Title
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    you would calculate the coefficient for several points (ionic strengths) do 3 or 4, then plot these. Activity coefficient on the y axis and ionic strength on the x axis (although you can do on which every way you want)

    • 10 months ago
  14. aaronq Group Title
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    it's much easier if you do it in excel though

    • 10 months ago
  15. roselin Group Title
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    yes, that is where I am having problem.

    • 10 months ago
  16. roselin Group Title
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    like that range is between 10^-4 to 1 right?

    • 10 months ago
  17. aaronq Group Title
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    yep thats the range of "I" they gave

    • 10 months ago
  18. roselin Group Title
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    how would I calculte that in excel though?

    • 10 months ago
  19. roselin Group Title
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    if I do it manually then can I chose to do something like I= 10^-4,10^-3, 10^-2 and 10^-1?

    • 10 months ago
  20. roselin Group Title
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    choose**

    • 10 months ago
  21. aaronq Group Title
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    yeah thats fine

    • 10 months ago
  22. aaronq Group Title
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    for excel you need the x data point and the y data point the x you can just make up: 10^4, 10^3 then for the y you have to use the result from the equation, so you would type up the equation and use the x data points, then fill it. If you're not familiar with excel trying it this way might take you awhile

    • 10 months ago
  23. roselin Group Title
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    okay, thank you so much.

    • 10 months ago
  24. aaronq Group Title
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    no problem, good luck!

    • 10 months ago
  25. roselin Group Title
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    thanks :-)

    • 10 months ago
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