The amino acid glycine (Gly) is often used as the main ingredient of a buffer in biochemical...

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The amino acid glycine (Gly) is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form (-NH3⁺) or as the free base (-NH2), because of the reversible equilibrium:

R-NH3⁺<-------> R-NH2 + H⁺

Question : When 75% of the glycine amino groups are in their protonated forms, what is the pH of the solution?

Olivia · Accepted Answer

Question : When 75% of the glycine amino groups are in their protonated forms, what is the pH of the solution?
Ans: 
Glycine has two pKa values, one for the carboxylic acid portion (pka1= 2.34) and other for amine portion (pKa2=9.6). the given pKa is 9.60, which is of the amine group.

The amino acid glycine (Gly) is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form...

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