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  4. What will be the nature of existence of an amino acid (containing one amino and one carboxylic acid group) in solution of pH < pKa1 ?

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Q. What will be the nature of existence of an amino acid (containing one amino and one carboxylic acid group) in solution of $ pH < pK_{a_1} $ ?

J & K CETJ & K CET 2018Biomolecules

Solution:

At low $pH$ (acidic solution) $COO^{-}$ ion acts as the base and accepts a proton to form the cation
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