The pKa,1 and pKa,2 of ortho and para isomers of phthalic acid (diprotic acid) are shown below: phthalic acid terephthalic acid CO2H .CO2H pka,1 2.98 3.51 HO ₂C pka,2 5.28 4.82 .CO2H phthalic acid terephthalic acid Provide an explanation on the differences of their pKa values.

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.