LTE LL). 2 3 5 (2 of 5) Titration of valine by a strong base, for example Nao re

Question

LTE LL). 2 3 5 (2 of 5) Titration of valine by a strong base, for example Nao reveals two pKs. The titration occurring at pK2 (pK2 9.62) is: O-NH2 -NH2 O-NH2 NH2 O-NH3-NH2 (3 of 5) Based on the graph below which of the following statements is correct? OThe charge on the predominant form of the amino acid side chain at pH 5 is+1 O The charge on the predominant form of the amino acid side chain at pH-5is-1 The charge onthe predominant form of the amo acid at pH-7 is-1 OThe charge on the predominant form of the amino acid at pH-1.5is+1 Both A) and D) are true

Explanation / Answer

Question 2)

Answer: option E (last option)

reason: because the last option is with a weak base, that offer other Pk that affect the titration and in all option only NH3 is a strong base, so strong acid don't are use for titration of strong base. COOH loses its proton at pk1 and NH3+ loses its proton at pk2.

Question 3) this question is not clear, it's very difficult to understand.

answer : option C

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