1. Acid and Base Reactions Shireen Rudina

3. ingegneria biologica Equipe de dibattito

4. Arrhenius Theory In water, acids dissociate to form H+ and bases dissociate to form OH- HCl + H 2 O  H 3 O + + Cl -

5. Concept Q: Which of these options are only acids? 1. HCl, NH 3, HI 2. H 2 CO 3, NaOH, HBr 3. H 2 CO 3, NH 4 +, HCl 4. HI, KOH, HBr

6. Arrhenius Strong/Weak Acids Strong acid – Dissociates completely Weak acids- everything else CH 3 COOH (aceto) NH 4 + HCl HNO 3 H 2 SO 4 HBr HI HClO 4

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

8. In teams: Calculate the pH of a 0.05 M HBr solution 1.Is HBr a strong acid? How much does it dissociate? 2.What is [H+]?

9. In teams: A 0.128 M solution of uric acid (HC 5 H 3 N 4 O 3 ) has a pH of 2.39. Calculate the K a of uric acid. 1.What is the equation for K a ? 2.What variables do we have?

10. http://www.youtube.com/watch?v=YqEK5ECc sDo http://www.youtube.com/watch?v=YqEK5ECc sDo http://www.youtube.com/watch?v=vyOnGA0c mp0 http://www.youtube.com/watch?v=vyOnGA0c mp0 http://www.elmhurst.edu/~chm/vchembook/ 183neutral.html http://www.elmhurst.edu/~chm/vchembook/ 183neutral.html

11. 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?

12. Arrhenius Acid/Base Reaction Acid + Base = Salt + Water HBr + NaOH  NaBr + H 2 O Neutralization

13. Phenolphthalein: Purple if pH > 7 Colorless if pH<7 A Neutralization Experiment CO 2 + H 2 O --> H 2 CO 3 Ca(OH) 2 + H 2 CO 3 --> CaCO 3 + 2 HOH

14. What is the result of a neutralization reaction: NaOH + H 2 CO 3 ? 1.NaH 2 + H 2 O 2.NaH 2 + H 2 O + CO 3 3.NaHCO 3 + H 2 O 4.NaCO 3 + H 2 O

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