what is a conjugate base? how does it decide the acidity of hydrogen?


Asked by pratikphookan | 8th May, 2014, 08:48: AM

Expert Answer:

conjugate base is formed by the removal of a proton from an acid. The strength of conjugate base decides the strength of corresponding strong acid from which it is formed. Consider the strong acid, HCl.
HCl → H+ + Cl-
HCl dissociates (ionizes) ~100 % in water, producing H+ and Cl-. That is why it is a strong acid; it donates protons readily.
Cl- is a weak base because it doesn't want the H+ back. If it did take the H+ back, then HCl would be formed. But, HCl doesn't remain together as a molecule in water. Cl- is a poor acceptor of protons, H+, therefore, and is considered a weak base. 

Answered by Prachi Sawant | 8th May, 2014, 10:53: AM

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