lecture7 - Wed Sept 17 2003 Today’s Lecture • Types of...

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Unformatted text preview: Wed. Sept. 17, 2003 Today’s Lecture • Types of Chemical Reactions and Solution Stoichiometry • 4.9 Acid Base Reactions • 4.10-4.11 Oxidation/Reduction Reactions Na+H2O – Acid Base Reactions: • Arrhenius concept: – acids produce hydrogen ions in aqueous solutions, and bases produce hydroxide ions • Bronsted/Lowry: – acid: a proton donor (H + ) – base: a proton acceptor HA (aq) + H 2 O ( aq ) fi H 3 O + ( aq ) + A- ( aq ) B ( aq ) + H 2 O ( aq ) fi BH + ( aq ) + OH- ( aq ) • Types of acid/base reactions: HCl/NaOH 1- strong base + strong acid: H + + Cl- + Na + + OH- → H 2 O + Na + + Cl- H + + OH- → H 2 O 2- strong base + weak acid: KOH/CH 3 COOH HC 2 H 3 O 2 (CH 3 COOH)+ K + + HO- → K + + H 2 O + C 2 H 3 O 2- HO- + HC 2 H 3 O 2 → H 2 O + C 2 H 3 O 2- (reacts completely) 3- strong acid + weak base: HCl/NH 3 H + + Cl- + NH 3 → NH 4 + + Cl- H + + NH 3 → NH 4 + (reacts completely) • Steps for the calculation of acid/base reactions: 1- list species present in aqueous solution 2- write balanced net ionic equation for reaction 3- calculate the # of moles of each reactant 4- determine the limiting reactant 5- use balanced net ionic equation to calculate the required reactant or product 6- convert to g or volume (of solution) as required • Notes: – assume complete reaction with weak acids or bases – acid-base reactions are called neutralization reactions: – Titrations: • volumetric analysis: acid-base titration is an...
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This note was uploaded on 01/16/2010 for the course CHEM CHEM 121 taught by Professor Peggy during the Spring '09 term at Simon Fraser.

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lecture7 - Wed Sept 17 2003 Today’s Lecture • Types of...

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