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CAS CH 131 (61)
Lecture

More Acids and Bases

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Department
Chemistry
Course
CAS CH 131
Professor
Andrei Lapets
Semester
Fall

Description
MoreAcids and Bases - • HAA K a pK a 1. HCl  Cl - 10 7 -7 - 2 2. H S2  4SO 4 10 -2 3. HF  F - 6.6x10 -4 3.18 - -10 4. NH  4H 3 5.6x10 9.25 • The larger the K ,athe smaller the pK meaaing a stronger acid • Weak Base 1. NH 3(aq) H 2 (l)H 4 (aq) OH -(aq) 2. K =b([OH][NH ])/[NH4] 3 • Relationship between acids and bases -14 1. K =wK x Ka= 10 a 2. pK =wpK + pKa= 14 b • Strong Base 1. Ex. Na(OH)  Na + OH + - H2O) 2. 3. [] 0.1 M 4. *** means that two products each have 0.1 M 5. pOH = -log[0.1] = 1 1. so, pH = 14 – pOH = 13 6. Ex. NH 3(aq)+ H 2 (l)H 4 (aq) OH (aq) 1. NH is30.1 M 2. pH is 11 1. so [H O ] = 10 -11 3 - -3 2. thus, [OH] = 10 and pOH = 3 7. Astrong base indicates a weak conjugative acid 8. Astrong acid indicates a weak conjugative base 9. between ClOH and BrOH, ClOH is a stronger acid because it is more electronegative, so the Cl pulls electrons from the O-H bond making it easier to lose the H 10. also, more bonds around the central atom will cause the atom to be more stable, so it does not want protons to give thus being a weak acid (strong base) 1. negative charge is spread throughout all atoms 2. HCl is a weak
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