B. C. D. and ng are constitutional isomers? and and Br and CH₂=CHCH, QUESTION 18 hich amine has the highest boiling point? A. CH3(CH2)5CH2NH2 OB. CH3CH2CH2N(CH2CH3)2 OC. CH3CH2CH2CH2CH2NHCH2CH3 nypected to have a similar boiling point.

(Pages 327 -330) this problem. Enter the formula for the conjugate acid for each of the following bases.

EDTA is a hexaprotic system with the pK, values: -ooc-CH2 H2C-coo pKal = 0.00, pKa2 = 1.50, pKa3 = 2.00, pK4 = 2.69, :N-CH2-CH2-N: pKas = 6.13, and pKa6 = 10.37. "ooc-CH2 H,C-coo The distribution of the various protonated forms of EDTA EDTA (or Y4-) will therefore vary with pH. For equilibrium calculations involving metal complexes with EDTA, it is convenient to calculate the fraction of EDTA that is in the completely unprotonated form, Y*-. This fraction is designated ayt-, Calculate ayt- at two pH values. pH = 3.70 ayt- = pH = 10.45 ay4- =

4) Draw a titration curve for the tetrapeptide Trp-Asp-Lys-Gly. Label all pK,s, the pl and the net molecular charges at pH 1 and pH 14 on the graph with their values.