Addallat

7+ Year Member
Jun 2, 2010
126
2
Status
Medical Student
EK textbook states the conjugate base of a weak acid can be either a
strong conjugate base
or
weak conjugate base


can anyone give me an example?
 

Hadi7183

5+ Year Member
Dec 8, 2013
63
22
NWT
Status
Pre-Medical
EtOH is a (very) weak acid (Pka =~ 15). Its conjugate base (EtO-) is a strong base.

CH3COOH is also a weak acid (not as weak as ethanol). Its conjugate base is a weak base.

So, the conjugate base of VERY weak acids (PKa>14) is strong, and the conjugate base of weak acids (1<PKa<14) is weak. The conjugate base of strong acids (e.g., HI) is a weak base (I-).


Sent using SDN Mobile
 
Last edited:

NextStepTutor_1

Next Step Test Prep Tutor
Sponsor
Vendor
2+ Year Member
Apr 29, 2014
606
259
^ Bingo. There is a distinction, which is not always made clear, between weak acids (that lead to weak conjugate bases) and very weak acids (that lead to strong conjugate bases).