The pH at which the positive and negative charges of an amino acid balance each other is called the

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The isoelectric point (pI) is the pH at which an amino acid or a protein has an equal number of positive and negative charges, and thus has a net charge of zero. At this pH, the molecule is isoelectric (meaning "same electrical") and is not attracted to an electric field. This point varies for different amino acids and depends on their side chain properties.

The PH at Which the Positive and Negative Charges of an Amino