BIOL 1F90 Lecture Notes - Lecture 4: Van Der Waals Force, Covalent Bond, Surface Tension

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Acids and bases: pure water ha the ability to ionize to: Hydroxide ion (oh-: in pure water: [h+][oh-]= [10-7m][10-7m]=[10-14m: molecules that release hydrogen ions in solution are called acids, acids are molecules that release hydrogen ions in solution. Strong acids release more h+ than weak acids: bases are molecules that lower the h+ concentration. May directly release oh- or react with water to produce oh: ammonia is a base, product of [h+] and [oh-] is always 10-14 m. Increasing oh- concentration lowers h+ concentration: h+ concentration is expressed as the solutions ph, ph: acidic solutions below 7. Above 7 is alkaline: importance of ph. H+ and oh- can bind many kinds of ions and molecules. Ability of two molecules to bind to each other. Ability of ions or molecules to dissolve in water: many biological processes function best within very narrow ranges of ph. Organisms usually tolerate only small changes in ph.

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