Amino acids, the building blocks of proteins, contain both acidic and basic grou

Question

Amino acids, the building blocks of proteins, contain both acidic and basic groups. One of the simplest is glycine, or aminoacetic acid. The pKa value for the glycinium cation is pKa1 = 2.35, and for the glycine zwitterion pKa2 = 9.77. Suppose you are given a solution of glycine of pH = 6.14 Calculate the concentrations of all species present in solution. Express your answers using scientific notation to three significant figures. How many mg of glycine do you need to dissolve in 1 mL of water to obtain a solution of pH 6.14?

Explanation / Answer

Part A:

clearly... if pH = 6.14

then,

by definition

pH = -log([H+])

solve for H+

[H+] = 10^-pH = 10^-6.14 = 7.244*10^-7

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