BIO 361 Lecture Notes - Titration Curve, Chemical Polarity, Acid Dissociation Constant

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Lecture 2: water and buffers. Describe how the structure of water creates a polar molecule with the capacity to hydrogen bond. Water is tetrahedral polar molecule. One water molecule can donate two h and accept two h. Strength of an h- bond depends on orientation of honor and acceptor. The hydrophobic effect is the tendency of water to minimize its contacts with hydrophobic groups. Dissolving non- polar in non- polar is entropically driven. Understand the relationship between ph, [h+], and pka ph = - log[h+] pk = - logk. Henderson- hasselbalch is used to calculate the ph of weak acids pk"s are disassociation constants. Determine whether a particular weak acid can act as a buffer at a given ph. Buffers are solutions that can resist changes in ph. Lecture 3: amino acids: describe the structures, sizes, polarities and charges of the 20 naturally occurring amino acids. Side chain is large & organic.

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