gran plots

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Oct 20, 2003
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is there a way to tell if you have a diprotic acid by looking at teh gran plot? i'm trying to ID an unknown weak acid for my quant class, and my titration curve makes it look mono, but when i got the pKa's, it was close to one of hte pKa values for the diprotic, and when i found the MW, it didn't match up with any of the monoprotics, and when i found it as if it were a diprotic, it matched up almost exactly. so i went to my prof., and he told me to do a Gran plot, which i did, only i don't know how to tell if it's mono or diprotic. Anybody else know?>