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

Question

What will be the nature of existence of an amino acid (containing one amino and one carboxylic acid group) in solution of pH < pKa1 ? (A) It exists as anion (B) It exists as cation (C) It exists as zwitter ion (D) It exists as neutral species with no charge

Tardigrade Admin · Accepted Answer

At low pH (acidic solution) COO- ion acts as the base and accepts a proton to form the cation <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/245fde43b770a7b07179039dd7fc20c7-.jpeg" />

Q. What will be the nature of existence of an amino acid (containing one amino and one carboxylic acid group) in solution of $p H < p K_{a_{1}}$ ?

It exists as anion

It exists as cation

It exists as zwitter ion

It exists as neutral species with no charge

At low $p H$ (acidic solution) $CO O^{-}$ ion acts as the base and accepts a proton to form the cation

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