11-18-08[lecture19]ll

11-18-08[lecture19]ll - Chem 116 Lecture 19 November 18,...

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Chem 116 Lecture 19 November 18, 2008 (LL) Key points about acids and bases so far Pay attention to charge on the acid or base There is always an acid and base on the reactant side and their conjugate acid or base on the product side An increase in Ka causes a decrease in Kb A decrease in Ka causes an increase in Kb Ka= equilibrium constant, water + weak acid When you have two different weak acids the larger the Ka the stronger the acid Two clicker questions to practice what we went over in the previous lecture A) HPO 4 2- base on reactant side B) HCO 3 - acid on reactant side (has an H+) C) CO 3 2- base D) H 2 PO 4 - acid ( has an H+ and one more H+ than HPO 4 2- ) Ka Reaction HA (aq) + H 2 O (l) ' A - (aq) + H 3 O + (aq) HA-Weak Acid Ka= [A - ] [H 3 O + ] / [HA] Weak Acid H 2 PO 4 (aq) + H 2 O (l) ' HPO 4 2- (aq) + H 3 O + (aq) H 2 PO 4 (aq)- acid loses H + H 3 O + (aq)– base accepts H + Kb Reaction B(aq) + H 2 O (l) ' HB + (aq) + OH - (aq) H 2 O (l)- acid loses and H + to OH - (aq) B (aq)- base , HB + gained the the H + Kb= [Hb + ] [OH - ] / [B]
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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11-18-08[lecture19]ll - Chem 116 Lecture 19 November 18,...

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