EDTA is a chelating agent that can bind to divalent metals. Indicate True or False for each. a. One EDTA molecule binds to two calcium ions.
b. One EDTA can bind to one magnesium ion.
c. Before EDTA titration, with the presence of the indicator Calmagite, a calcium solution will show a blue color, and upon EDTA titration with the calcium solution, the color will turn red once it has reached the endpoint.
d. There is no need to standardize EDTA solution since the concentration of EDTA is always accurate based on mass measurement.

1. Lysine

2. Aspartic acid

3. Serine

4. Alanine

5. Tryptophan

Explanation:

Amino acids are biomolecules that contain two functional groups and one R side chain. The two functional groups are: carboxyl group and amino group.

The α-amino acids are the amino acids in which the two functional groups and the R side chain are attached to the α-carbon of the amino acid. They are total 22 α-amino acids.

1. A basic amino acid: Lysine is a positively charged, polar basic amino acid with a lysyl side chain.

2. An acidic amino acid: Aspartic acid is a negatively charged, polar acidic amino acid with an acidic carboxymethyl group.

3. A neutral polar amino acid: Serine is a polar and neutral amino acid with a hydroxymethyl group.

4. A non-polar aliphatic amino acid: Alanine is an aliphatic, nonpolar and neutral amino acid with a methyl side chain.

5. An aromatic amino acid: Tryptophan is an aromatic, nonpolar and neutral amino acid with an indole side chain.