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?

- anonymous

- jamiebookeater

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- aaronq

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

- anonymous

so from 10^-4 to 1?

- anonymous

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

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## More answers

- aaronq

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

- anonymous

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

- aaronq

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

- aaronq

on excel of course

- anonymous

we have to calculate and plot it

- aaronq

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

- anonymous

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

- aaronq

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

- anonymous

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

- aaronq

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)

- aaronq

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

- anonymous

yes, that is where I am having problem.

- anonymous

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

- aaronq

yep thats the range of "I" they gave

- anonymous

how would I calculte that in excel though?

- anonymous

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

- anonymous

choose**

- aaronq

yeah thats fine

- aaronq

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

- anonymous

okay, thank you so much.

- aaronq

no problem, good luck!

- anonymous

thanks :-)

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