lecture 2 outline

lecture 2 outline - molecules. 2. It is easier for an...

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Lecture #2: Water, pH and Buffers I. Water A. Small Dipole B. Hydrogen bonding 1. Between water molecules (fig 2-2)
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2. Between water and solutes C. Hydrophilic, hydrophobic and amphipathic compounds 1. Hydrophilic (fig 2-6)
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2. Hydrophobic 3. Amphipathic (fig 2-7)
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D. Water as a reactant 1. In condensation reactions (fig 2-22) 2. Hydrolysis reactions
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II. pH A. The ionization of water as the basis of the pH scale B. Key Points
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III. Buffers: resist changes in pH of a solution (soln.) when small amounts of H + s (protons) or OH - s (hydroxides) are added. A. pKa and Buffers 1. The pH of a solution affects the ionization state of side groups on
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Unformatted text preview: molecules. 2. It is easier for an ionizable group to give up its proton when there are fewer other protons (and more available hydroxides) in the soln than when the soln. is proton-rich. 3. Definition of pKa 4. Henderson Hasselbalch equation 5. Titration curve of acetic acid (fig 2-17) 6. How does this buffering work? (fig 2-19) B. Physiological Buffers 1. Intracellular fluids (pH 6.9-7.4) a) phosphate buffer system b) Other ways intracellular pH is buffered 2. Extracellular fluids (pH near 7.4): the bicarbonate buffer system (Box 2-4)...
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lecture 2 outline - molecules. 2. It is easier for an...

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