BSC 2010C Lecture Notes - Lecture 3: Ph, Surface Tension
Document Summary
Chap 3: h2o & fitness of environment: properties of h2o. H2o molecules: polar covalent -> partial charges, h2 bond to each other. + h2 bond -> ability for h2o to release temperature (to) + adhesion: h2o molecules stick to something else. + surface tension: how hard to break/stretch liquid surface. + high specific to: amount of heat gained to change of to. + expand when frozen -> less dense, float more: acids & bases. Hydrophobic: repelled by h2o, mostly non polar substance. Buffers: in cells, minimize chances h/oh ion concentration, absorb excess oh-, release excess h+, is a weak acid-base pair: ph. Poh = -log[oh-] lower ph -> stronger acids: acid rain. Ph < 5. 6 (normal rain: acidification of seawater @ coral reefs. [h+] = 10-5 m: [oh-] = 0. 0000001 = 1x10-7 m poh = -log[oh-] = 7 ph = 14 poh = 7, ph1 = 12, ph2 = 8.
