1. What is the purpose or function of the ninhydrin solution? A) It is a visuali

Question

1. What is the purpose or function of the ninhydrin solution?

            A) It is a visualizing agent used during TLC analysis

            B) It is used as a protecting agent for the phenylalanine methyl ester.

            C) It is an amide intermediate formed during the reaction

            D) It is used as the TLC developing solvent

            E) It serves as the solvent for amino acids

2. If the procedures in this experiment direct you to use 110 mg of acetic anhydride, how many mL of the compound do you need (give your answer in scientific notation)? The density of acetic anhydride is 1.08 g/mL.

3. Which statement below correctly describes how amino acids join?

            A Amino acids join by formation of amino bonds between them.

            B) Amino acids form bonds via E1 elimination reactions

            C) Amino acids join by linking the amino groups of the two compounds together.

            D) Amino acids join by linking the acid group of one amino acid to the amino group of another.

E) Amino acids join by forming an ester linkage.

Thank you in advance!

Explanation / Answer

1. A.  It is a visualizing agent used during TLC analysis

2.. Density = Mass / Volume, mass = 110 mg = 0.110 g, density = 1.08 g/mL, volume = mass/density = 0.110 / 1.08 = 0.1018 mL

3. D) Amino acids join by linking the acid group of one amino acid to the amino group of another.

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