Why are protecting groups necessary in solid phase peptide synthesis (SPPS)?
Why are protecting groups necessary in solid phase peptide synthesis (SPPS)?
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H34a a1-3 a2-8 a3-13 PO has three acidic protons with the following K values: K = 7.1 x 10 K = 6.3 x 10 K = 4.5 x 10 If you have this acid in a solution with a pH=5 what is the predominate form of the compound in solution?
H34a a1-3 a2-8 a3-13
PO has three acidic protons with the following K values:
K = 7.1 x 10
K = 6.3 x 10
K = 4.5 x 10
If you have this acid in a solution with a pH=5 what is the predominate form of the compound in solution?
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Consider the polyprotic acid HAsO4(arsenic acid), which has the Ka values, in no particular order, of 10-7, 10-2 3, and 10-12 for the equilibria shown below:
Consider the polyprotic acid HAsO4(arsenic acid), which has the Ka values, in no particular order, of 10-7, 10-2
3, and 10-12 for the equilibria shown below:
Ka1: H3AsO4 (aq) + H2O (l) ⇌ H2AsO4– (aq) + H3O+ (aq)
Ka2: H2AsO4– (aq) + H2O (l) ⇌ HAsO42- (aq) + H3O+ (aq)
Ka3: HAsO42- (aq) + H2O (l) ⇌ AsO43- (aq) + H3O+ (aq)
Correctly identify the values of Ka2 and Ka3
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Lysine is an amino-acid with a basic side chain. The pKa of the acid/base groups is shown on the structure (note: this structure will not exist as shown at any pH).
Lysine is an amino-acid with a basic side chain. The pKa of the acid/base groups is shown on the structure (note: this structure will not exist as shown at any pH).
If lysine is in a solution with a pH = 7, what is the charge on the molecule? Consider what charge an amine group has when protonated and what charge a carboxylic acid group has when deprotonated.
A) -1
B) -2
C) +1
D) 0
E) +2
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