Question

Determine the mean ionic activity for a 0.100-molal solution of Cr(NO3)3 if its mean activity coefficient is 0.285. 

          Determine the mean ionic activity for a 0.100-molal solution of Cr(NO3)3 if its mean activity coefficient is 0.285.

Added by Adri-N W.

Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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Determine the mean ionic activity for a 0.100-molal solution of Cr(NO3)3 if its mean activity coefficient is 0.285.
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Transcript

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00:01 If you were asked to calculate the total concentration of all the ions in the solution, you would recognize that chromium -3 nitrate separates into one chromium ion and three nitrate ions.
00:13 So a 0 .1 molar solution would contain 0 .1 molar chromium and 0 .3 molar nitrate.
00:21 You would sum these together to get the total ion concentration.
00:26 In the case of calculating activities, an activity is, simply the concentration multiplied by the activity coefficient.
00:35 So knowing the mean activity coefficient, we can calculate the activities of each of these by multiplying their concentrations by the activity coefficient, the mean activity coefficient...
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