Titration of valine by a strong base, for example NaOH, reveals two pK's. The titration reaction occurring at pK2 (pK2 = 9.62) is:
A) —COOH + OH? ? —COO? + H2O.
B) —COOH + —NH2 ? —COO? + —NH2+.
C) —COO? + —NH2+ ? —COOH + —NH2.
D) —NH3+ + OH? ? —NH2 + H2O.
E) —NH2 + OH? ? —NH? + H2O.
Ans: D) —NH3+ + OH? ? —NH2 + H2O.
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What will be an ideal response?