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Acid and Base Reactions

Acid and Base Reactions . Shireen Rudina. ingegneria biologica. Equipe de dibattito. Arrhenius Theory. In water, acids dissociate to form H+ and bases dissociate to form OH- HCl + H 2 O  H 3 O + + Cl -. Concept Q: Which of these options are only acids?. 1. HCl , NH 3 , HI

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Acid and Base Reactions

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  1. Acid and Base Reactions Shireen Rudina

  2. ingegneria biologica Equipe de dibattito

  3. Arrhenius Theory • In water, acids dissociate to form H+ and bases dissociate to form OH- HCl + H2O  H3O++ Cl-

  4. Concept Q: Which of these options are only acids? 1. HCl, NH3, HI 2. H2CO3, NaOH, HBr 3. H2CO3, NH4+, HCl 4. HI, KOH, HBr

  5. Arrhenius Strong/Weak Acids • Strong acid • Dissociates completely • Weak acids- everything else CH3COOH (aceto) NH4+ HCl HNO3 H2SO4 HBr HI HClO4

  6. Arrhenius Strong/Weak Bases • Strong bases: LiOH NaOH KOH RbOH CsOH Ba(OH)2 Ca(OH)2 Sr(OH)2 • Weak bases: everything else

  7. In teams: Calculate the pH of a 0.05 M HBr solution • Is HBr a strong acid? How much does it dissociate? • What is [H+]?

  8. In teams: A 0.128 M solution of uric acid (HC5H3N4O3) has a pH of 2.39. Calculate the Ka of uric acid. • What is the equation for Ka? • What variables do we have?

  9. http://www.youtube.com/watch?v=YqEK5ECcsDo • http://www.youtube.com/watch?v=vyOnGA0cmp0 • http://www.elmhurst.edu/~chm/vchembook/183neutral.html

  10. In teams: You have an unknown acid. When you put 1 M in water, you see a pH that corresponds to a specific dissociation percentage. • Find the Ka for the acid that dissociates: • Team 1: 1% • Team 2: 2% • Team 3: 0.1% • What acid do you have?

  11. Arrhenius Acid/Base Reaction Acid + Base = Salt + Water HBr + NaOHNaBr + H2O Neutralization

  12. A Neutralization Experiment Phenolphthalein: Purple if pH > 7 Colorless if pH<7 CO2 + H2O --> H2CO3 Ca(OH)2 + H2CO3 --> CaCO3 + 2 HOH

  13. What is the result of a neutralization reaction: NaOH + H2CO3? • NaH2 + H2O • NaH2 + H2O + CO3 • NaHCO3 + H2O • NaCO3 + H2O

  14. Bronsted-Lowry Acid/Base Reaction Conjugate acids and bases

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