Grade 11Physical Chemistry
The weakest base among the following isH-CH3-CH3O-Cl-How to determine weak base And strong base explain
The weakest base among the following is
H-
CH3-
CH3O-
Cl-
How to determine weak base And strong base explain
3 Answers
Arun
Dear student
I would use pKa values of commons acids to determine this. Remember that the lower the pKa, the weaker the conjugate base:
pKa:
HCl = -6
CH3OH = 16
H2 = 35 (sometimes 22) ---> not a common acid, but as been done experimentally
CH4 = 50
Notice the conjugate bases weakest to strongest go: Cl-, CH3O-, H-, CH3-
Based on the lowest pKa value, we can determine the weakest base.
pKa:
HCl = -6
CH3OH = 16
H2 = 35 (sometimes 22) ---> not a common acid, but as been done experimentally
CH4 = 50
Notice the conjugate bases weakest to strongest go: Cl-, CH3O-, H-, CH3-
Based on the lowest pKa value, we can determine the weakest base.
Regards
Arun (askIITians forum expert)
Hemant kumar
A. I would use pKa values of common acid to determine it Remember the lowest the pKa,the weaker the conjugate base.
pKa:
HCl= -6
CH3OH= 16
H2=35 (sometime 22):- not a common acid but has been done experimentally.
CH4=50
Therefore the conjugate base weakest to strongest go :- Cl , CH3O , H2 , CH3 . Based on lowest value we can determine the weakest base
Boss
Any strong acid will have a weak conjugate base
Consider the given option as conjugate base
Acid - H+ = conjugate base
So add H+ to the options to get the acid
U get H2, CH4, CH3OH, HCl
The strongest acid among these will give weak base
Clearly HCl is the strongest among them(CH3OH being alcohol is a weak acid, H2 and CH4 are also weaker acid than HCl)
Hence the corresponding conjugate base I.e. Cl- is the weakest among them
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