Chapter 24, Problem 10STP

Interpretation Introduction

Interpretation: To show the reaction when internal neutralization takes place in the glycine molecule.

Concept introduction: Amino acids are amphoteric in nature since it has both carboxyl and amino acid groups which means they can behave as both acid and base.

Answer to Problem 10STP

The internal neutralization reaction of glycine can be depicted as follows:

  

Explanation of Solution

Glycine can act as both acids as well bases. About all amino acids exist in zwitter ions.

The formation of zwitter ion in the case of glycine takes place as follows:

  

In strongly alkaline conditions, glycine can act as a base

The reaction of glycine with a base leads to the formation of a negative ion when an ammonium ion loses a proton.

The chemical equation can be depicted as follows:

  

In acidic conditions, glycine can act as a base.

The reaction of glycine with acid leads to the formation of a positive ion as the carboxylate ion gains a proton.

The chemical equation can be depicted as follows:

  

Conclusion

Yes, glycine can undergo an internal neutralization reaction and it forms a zwitter ion.