Biol 112 - #3 - January 12

Biol 112 - #3 - January 12 - Learn about cutting-edge...

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Unformatted text preview: Learn about cutting-edge research over lunch with cool profs 3 days only: Mon, Wed, Fri January 17, 19, 21 11:30 AM Redpath Museum More info: www.mcgill.ca/ science/ Wednesday, January 12, 2011 3 Buffers and Large Molecules 1 Wednesday, January 12, 2011 If the reaction (dissociation) is complete , it is a strong acid , such as HCl. The carboxyl group (COOH) is common in biological compounds. It functions as a weak acid because it dissociates partially and reversibly COOH --> COO + H + Acids release/donate H + ions Wednesday, January 12, 2011 NaOH ionizes completely to Na + and OH . The OH absorbs H + to form water. It is a strong base . The amino group (NH 2 ) is an important part of many biological compounds; it functions as a weak base by partially and reversibly accepting H + NH 2 + H + (NH 3 ) + Bases accept H + (release OH ). Wednesday, January 12, 2011 water is a weak acid and base rare (5 x 10-9 ): hydronium ions are very reactive! pure water is pH 7; but why is almost all water acidic? Wednesday, January 12, 2011 pH: H + in moles per liter 1 - 10-14 is sorta dorky for convenience, we describe as log 10 and voila: a pH range of 1 - 14 pure water: H + is 10-7 M 1 M HCL: H + is 1 M 1 M NaOH: H + is 10-14 M Wednesday, January 12, 2011 pH Values of Some Familiar Substances Properties of Molecules Wednesday, January 12, 2011 Buffers make the overall solution resistant to pH...
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This note was uploaded on 03/14/2011 for the course SCIENCE 112/120 taught by Professor Mitamaer/vogel during the Spring '11 term at McGill.

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Biol 112 - #3 - January 12 - Learn about cutting-edge...

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