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### 12 Cards in this Set

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 What is the distance between: 1) A hydrogen and oxygen atom in a water molecule 2) the hydrogen and oxygen of two hydrogen bonded molecules 1) 1.0 Angstrom 2) 1.8 Angstrom What arrangement of 2 molecs H-bond is stronger? Weaker? Linear is strongest. Bent is weaker. How many bonds on average is each H2O molec in water involved in? 3.4 Dielectric constant? (D) Whe factor by which attractive forces are decreased by a solvent What is the dielectric constant of water? 80 amphiphile molecule that has both a hydrophobic and hydrophilic portion What is the approximate speed of the ionization of water? about 10^-9th seconds (1 nanosecond) Equilibrium constant of water (equation) Kw=[H+][OH-] Kw at equilib = 10^-14 Ionization of water equation pH = -log[H+] Henderson-Hasselbalch equation pH = pKa+log([A-]/[HA]) Buffers - acid-base pair -effectiveness depends on [] and - when the pH is in the vicinity of the pKa (+/-1)