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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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11 years ago
Calculate the concentration of the 5 chemical species present in a solution that is 0.015 Molar di-sodium oxalate in pure water.  (Na2Oxalate and H20...no dissolved gases or other contaminants).  

Please HELP im so lost I don't know where to start and I read my book but it didn't help at all.
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#1
11 years ago
haha you're in a johnson's class too eh?

All I'm sure of is that the reactions are Na2C2O4 + water Rightwards Arrow NaHC2O4 + NaOH  (pka is 4.266)
                                                  and then NaHC2O4 + H20 Rightwards Arrow H2C2O4 + NaOH (pka is 1.250)
So we've got the reactions and therefore know the species (and prolly all the required info).

What to do from here, I do not know either :/
EDIT: well its 4am so you wont get this in time, but I found this http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch17/diprotic.php  that shows how to work through the dissociation math for a diprotic base.  cheers!
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