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Phthalic acid is an aromatic dicarboxylic acid, with pKa values of 2.9 and 5.5. What is...

Phthalic acid is an aromatic dicarboxylic acid, with pKa values of 2.9 and 5.5. What is the net charge on phthalate at a pH of 3.9?

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Answer #1

Pthalic acid:

The hydrogen connected to singely bonded oxygen is responsible for acidic character of Pthalic acid.

At lower pH, both hydrogens are connected to oxygen.As we increase the pH of system, thepthalic acid starts releasing H+ and ultimately leaves both of its replishble hydrogens.

Thus at pH=3.9

So,the net charge is zero.

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