[yolop]

you also have the forms above and below the isoelectric point in small quantities.  You can't neglect this.

I finally solved this problem.  After calculating the pI I setup an equation:
0.1M=[AA-]+[AA0]+[AA+]
 Since I have the ratios from henderson equation you get:
0.1M = x+10.715x+x

solving for X gets all three amounts.


Thanks for all the help people.   I was looking at it to be too complicated and did a lot more work.