Quiz 4
- 1.For both versions, any acid whose pKa is close to the desired pH is acceptable. The pKa needed to be shown
- 2. For both versions, both Kas and Kbs need to be given HF:Ka=3.5*10-4;HNO2:Ka=4.5*10-4;F-:Kb=2.8*10-11;NO2-:Kb=2.2*10-11
Krxn=Ka*Kb/Kw
- v1:Krxn=(3.5*10-4)(2.2*10-11)/10-14=.77
This result is consistent with the reaction running downhill as the weaker acid and base are on the reagent side and Krxn<1
- v2:Krxn=(4.5*10-4)(2.8*10-11)/10-14=1.26
This result is consistent with the reaction running downhill as the weaker acid and base are on the product side and Krxn>1