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Grade: 11
        
The weakest base among the following is
H-
CH3-
CH3O-
Cl-
How to determine weak base And strong base explain
10 months ago

Answers : (3)

Arun
21965 Points
							
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.
 
 
Regards
Arun (askIITians forum expert)
10 months ago
Hemant kumar
15 Points
							
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
10 months ago
Boss
13 Points
							
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
7 months ago
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