Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

roselin

  • one year ago

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?

  • This Question is Closed
  1. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    they want the activity coefficients for the different ions considering the ionic strength given

  2. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so from 10^-4 to 1?

  3. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i am using the davies equation to calculate it, so each time I have to change the ionic strength th?

  4. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

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

  5. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    its \[10^{-4}\le I \le1\]

  6. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  7. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    on excel of course

  8. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    we have to calculate and plot it

  9. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i guess do a few points for each ion and then plot it

  10. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can I show you the full question ? please tell me what I should do

  11. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  12. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if I were to do this manually using that given range, how would I approach it?

  13. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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)

  14. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    it's much easier if you do it in excel though

  15. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes, that is where I am having problem.

  16. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    like that range is between 10^-4 to 1 right?

  17. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yep thats the range of "I" they gave

  18. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how would I calculte that in excel though?

  19. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if I do it manually then can I chose to do something like I= 10^-4,10^-3, 10^-2 and 10^-1?

  20. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    choose**

  21. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah thats fine

  22. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  23. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay, thank you so much.

  24. aaronq
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no problem, good luck!

  25. roselin
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks :-)

  26. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.