Why is Ba(OH)2 and ZnSO4 added to the standards (for glucose tolerance test) when they do not contain protein?

Consider the amino acid valine, whose pKavalues are given below. (a) Draw the major form of valine when in a solution of pH = 6.0. (b) Draw the major form of valine when in a solution of pH = 12.0

See Appendix on p5 for list of amino acids. Aspartame is a sweetener. The structure of aspartame, along with the titration curve showing its pKal and pka2 is given below. 14 € 12 10 8 6 4 2 0 pK₂2 = 7.87 PK₁₁ = 3.19 0 0.5 1 Equivalents of NaOH a) Copy the structure of aspartame. i) 1.5 2 OH S NH₂ Aspartame LOCH 3 Identify the two ionisable groups. Re-draw the groups in their protonated forms, and label each with their pka. ii) Circle and identify the two amino acids in aspartame.

2. Use your calculated values of Ksp(4.0x10^-8) and Kf(1.7x10^-4) to explain why CdC2O4 is dissolved by ammonia.