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Q. 2.75

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Organic Chemistry
Found in: Page 90

Short Answer

Amino acids such as glycine are the building blocks of large molecules called proteins that give structure to muscle, tendon, hair, and nails.

a. Explain why glycine does not actually exist in the form with all atoms uncharged, but actually exists as a salt called a zwitterion.

b. What product is formed when glycine is treated with concentrated HCl?

c. What product is formed when glycine is treated with NaOH?

a. Due to the presence of an acidic group (OH) and a basic group , the glycine exists in a zwitterion form.

See the step by step solution

Step by Step Solution

Amino acids

  • An amino acid consists of one acid group and one base group.
  • The two or more amino acids condense to form a polypeptide chain (protein) through a polypeptide bond (CONH).
  • When an amino acid is in an acid solution, it abstracts the proton from the acid, and when an amino acid is in a basic solution, it releases its proton.

Properties of glycine

a. Glycine is an amino acid with one COOH group (acid group) and one (basic group).

The COOH group releases one proton and acquires a negative charge; therefore, the glycine amino acid exists in neutral form or zwitterion form.

b. When glycine reacts with concentrated HCl, it abstracts the ion from HCl and acquires a positive charge on (base).

The reaction of glycine with concentrated HCl

c. When glycine reacts with concentrated NaOH, it releases the ion by COOH and acquires a negative charge on COOH.

The reaction of glycine with concentrated NaOH

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