Week 6- Acid and Bases
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This 2 page Class Notes was uploaded by BettyAnn Mead on Friday March 6, 2015. The Class Notes belongs to 112 at University of Massachusetts taught by Voigtman in Spring2015. Since its upload, it has received 71 views.
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Date Created: 03/06/15
Chemistry 112 03062015 Acids and Bases Arrhenius De nitions Acid Any substance that when dissolved in water increases H concentrations M Any substance that when dissolved in water increases OH concentrations 0 Water is BOTH an ACID and a BASE KwH30OH 100E14 at 25 Celsius So pure water always has equal concentration of H30 and OH making it NEUTRAL 0 So both are very small but NOT ALWAYS INSIGNIFICANT Any substance that when dissolved in water increases H30 also MUST decrease OH because their product is a constant at a given temperature 0 Any substance that when dissolved in water increase OH also MUST increase H30 BronstedLowry De nitions Acid Proton donor M Proton acceptor Therefore it is an equilibrium system which creates weaker bases and acids Polyprotic Acid An acid that can donate two or moew protons Polyprotic Base A base that can accept two or more protons o Monorpotic o Biprotic o Triprotic When is Kgtgt1 When there is a strong acid 0 When the acid is strong the reaction proceeds towards the products Example HCl When is Kltlt1 When there is a weak acid 0 When the acid is weak the reaction proceeds towards the reactants ExampleCH3C02H The pH Scale 0 pxogx In general for whatever x happens to be 0 pHogH30 pOHogOH All proton transfer reactions proceed from the stronger acid and base to the weaker acid and base FUN FACTS ABOUT POLYPROTIC ACIDS Polyprotic acids are weak after they lose the rst proton o The rst proton controls the pH Cations DO NOTHING IN SOLUTION They are surrounded by water molecules but there is no change in pH 7 Conjugate bases of strong acids are such weak bases that they have no affect on pH 0 EXCEPTION Sulfuric Acid 0 Group 1 amp 2 cations don t do anythong Example Li Na K Rb Cs Ca Ba and Sr
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