Given the following reaction, what descriptive term can be applied to HL? Biprot

Question

Given the following reaction, what descriptive term can be applied to HL? Biproteal Confused Disproportionated Amphiprotic Given the following reaction, which of the following expressions is correct? Which of the following species is the most likely be correctly treated as two separate monoprotic acids? Acetic acid [pKa = 4.76) Maleic acid [pKa1 = 1.9, pKa2 = 6.07] 2-hydroxybenzoic acid [pKa1 = 2.972, pKa2 = 13.7] Glutamic Acid [pKa1 = 3.2, pKa2 = 4.30, pKa3 = 9.96] Phthallic acid [pKa1 = 2.91, pKa2 = 5.01) The fraction of species for an amino acid in the form L- will increase as pH rises True False

Explanation / Answer

1- D . Ampiprotic since it can absorb H+ and release H+ hence

2- C , actually its Ka1 x Kb1 = Kw , hence none of the options were correct

3- C here the two pka values correspond to COOH and OH while for others both are COOH, hence 2 hydroxy benzoic acid can be considered as two seperate mono protic acid.

4-Trues . As pH rises it goes to basic form hence amino acid COOH will lose H+ and also NH3+ group too loses H+ and we will have COO- and NH2 , thus it exists as L-

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