# Chemistry

A solution contains 0.010 M BaCl2. Calculate the molarity of the ions in solution, the ionic strength of the solution, the activity coefficient of the barium ion and its activity. Repeat for the chloride ion.

So I know the molarities for the ions in this compound ((Ba^2+) = 0.01 M and (Cl^-) 0.02). I still don't know what the ionic strength value is. Does it correspond to a specific formula? I tried looking it up, but all I got was various equation with random constants.

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1. Ionic Strength= 1/2 (.01)*2+1/2(.02)*1=.01+.01=.02M

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2. Whatttt? Thanks!

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3. Actually, i'm kind of second guessing your post. It doesn't look right to me. I just can't point my finger at it....

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4. https://en.wikipedia.org/wiki/Ionic_strength
Acutally, I did miss it. The charge is squared.
Ionic Strength= 1/2 (.01)*2^2+1/2(.02)*1^2=.02+.01=.03M

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5. How about the activities, how do I solve those?

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6. activity = concn*activity coefficient or for Ba^2+ it is
a = (Ba^2+)*fx. Now you want to find fx
Look up the Debye-Huckle equation.

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posted by DrBob222
7. is the concentration from the ionic strength value or from the molarity of ions?

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8. how can i find the activity coefficients?

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9. The activity coefficient is found by the Debvye-Huckel equation. You use ionic strength in that, not concentration. Then concn(molarity)*activity coefficient - activity.

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posted by DrBob222

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