Here are the pka values of important compounds in Ochem that I would like to share with people. It's pretty important to compare the acidity of any of the two, three, or four compounds on this list. I use the pka values which I have memorized to help me compare them [smaller pka value meanst stronger acid]. However if you have never memorized any pka valus in an ochem class, or if you feel this is gonna be too much, just go ahead an keep the order in mind
Name of the compound, Pka value
HCL [not organic] -8 (strongest acid in this list)
Carboxylic acid 4
Ammonium ion [NH4+, RNH3+,...] 9
phenols 10
beta keto compounds 10-11
amides 14
water 15
alcohols 16-17
alpha hydrogen of ketones or aldehydes 20
alkynes 25
amines [NH3, RNH2, ...] 38
alkenes 43
alkanes 50 (weakest acid in this list)
Name of the compound, Pka value
HCL [not organic] -8 (strongest acid in this list)
Carboxylic acid 4
Ammonium ion [NH4+, RNH3+,...] 9
phenols 10
beta keto compounds 10-11
amides 14
water 15
alcohols 16-17
alpha hydrogen of ketones or aldehydes 20
alkynes 25
amines [NH3, RNH2, ...] 38
alkenes 43
alkanes 50 (weakest acid in this list)
These are good to know for those little questions that ask which one is more acidic/basic.
