BCH 369 Lecture Notes - Lecture 2: Covalent Bond, Phase Diagram, Boiling Point
Document Summary
2 in a water molecule are weaker lot weaker a than covalent bond x. 1not hydrogen bonds are strong enough to be useful yet weak enough to be easily formed and broken again. 0 n hydrogen bonds tend to be nearly linear. In 200range if asked to draw hydrogen bonds make them linear. Entropy favors aggregation into a single drop since this minimizesthe amount of ordered water on thesurface. Kw for water is notconstant it changes with pressure and temperature. The pka of a weak acid is the ph at which equal amounts of protonated. Memorize this carboxylate group pka typically about 2 to 4. Amino group pka typically about 91010 if you put this amino group in water which is ph7 you"llsee ntl. When ph is more basic than ka you"ll see deprotonated. When ph is protonated form less basic than pka you"llsee. Draw the structure at ph 12 amino group will be deprotonated carboxylated will be deprotonated.
