To do an experiment with the peptide H-A-P-P-Y you need to make two buffers. One where the peptide has a net negative charge (Buffer A) and one where the peptide has a net positive charge (Buffer B). The pH of both buffers has to be within 2 pH units of the pI (pI=7.25), but you want the largest net charge you can have along with having the best buffer possible.
You have concentrated solutions of the following compounds available to you in the lab:
Acetic Acid (pKa = 4.8); Acetate; H3PO4 (pKa = 2); H2PO4- (pKa = 7.2); HPO42- (pKa = 12); PO43-; carbonic Acid (pKa = 6.4); bicarbonate (pKa = 10.3); carbonate; and powders of each amino acids.
Buffer A: What is the intended pH of this buffer:
Protocol to make the buffer:
Buffer B: What is the intended pH of this buffer:
Protocol to make the buffer:
Answers: 3
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