Biochem lec notes_water_acids_bases

Biochem lec notes_water_acids_bases - B iochem 153A, own...

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Biochem 153A, own notes March 21, 2009, Tue Water, Acid Base Chemistry Water forms H-bonds D –H - - -A D = electronegative donor atom (Oxygen, Nitrogen) H= Hydrogen atom A = acceptor atom (could be electronegative too!) O-H bond distance is .958 Angstroms Oxygen = sp 3 hybridized o Bond angle btwn 2 H’s and oxygen = 104.5 0 Noncovalent bonds collectively called Van der Waals forces – arise from electrostatic intractns Good solvents interact w/ solutes more strongly than solute molecules interact w/ each other When ions are completely surrounded by solvent, called solvated o When ions are completely surrounded by water (that’s the solvent), called hydrated Hydrophobic effect : tendency of water to minimize contacting with hydrophobic molec’s, causing molec’s to fold in such a way that puts the hydrophobic/lipid-soluble parts on the inside and hydrophilic parts on the outside, “touching” the water Thermodynamics of water : Enthalpy changes can be more (+ enthalpy) or less favorable (0 enthalpy??) when nonpolar solutes
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Biochem lec notes_water_acids_bases - B iochem 153A, own...

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