(C) Glycine is an amphoteric amino acid. The $pH$ of an amphoteric amino acid solution is given by the formula: $pH = \frac{pK_{a1} + pK_{a2}}{2}$.$pK

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(C) Glycine is an amphoteric amino acid. The $pH$ of an amphoteric amino acid solution is given by the formula: $pH = \frac{pK_{a1} + pK_{a2}}{2}$.$pK_{a1} = -\log(4.5 \times 10^{-3}) = 3 - 0.653 = 2.347$.$pK_{a2} = -\log(1.7 \times 10^{-10}) = 10 - 0.23 = 9.77$.$pH = \frac{2.347 + 9.77}{2} = \frac{12.117}{2} \approx 6.06 \approx 6.1$.