Preferred Label : levelling effect;
IUPAC definition : The tendency of a solvent to make all Brønsted acids whose acidity exceeds a certain
value appear equally acidic. It is due to the complete transfer to a protophilic solvent
of a hydron from a dissolved acid stronger than the conjugate acid of the solvent.
The only acid present to any significant extent in all such solutions is the lyonium
ion. For example, the solvent water has a levelling effect on the acidities of HClO
sub 4 /sub , HCl and HI: aqueous solutions of these acids at the same (moderately
low) concentrations have the same acidities. A corresponding levelling effect applies
to strong bases protogenic solvents.;
Origin ID : L03506;
Automatic exact mappings (from CISMeF team)
- See also
The tendency of a solvent to make all Brønsted acids whose acidity exceeds a certain
value appear equally acidic. It is due to the complete transfer to a protophilic solvent
of a hydron from a dissolved acid stronger than the conjugate acid of the solvent.
The only acid present to any significant extent in all such solutions is the lyonium
ion. For example, the solvent water has a levelling effect on the acidities of HClO
sub 4 /sub , HCl and HI: aqueous solutions of these acids at the same (moderately
low) concentrations have the same acidities. A corresponding levelling effect applies
to strong bases protogenic solvents.
