The following values are based upon the Hammett acidity function.

Take note that the Hammett acidity function clearly avoids water in its equation.

For example, the Hammett acidity function, H, has been developed in connection with Superacids.

Conant christened them "superacids" and laid the foundation for the development of the Hammett acidity function.

The Hammett acidity function, H, can replace the pH in concentrated solutions.

All proton-producing acids stronger than 100% sulfuric acid are considered superacids, and are characterized by low values of the Hammett acidity function.

The Hammett acidity function (H) is a measure of acidity that is used for very concentrated solutions of strong acids, including superacids.

He is also known for his research into superacids and his development of a scheme for comparing their acidities based on what is now known as the Hammett acidity function.

Concentrated solutions of hydrogen fluoride are much more strongly acid than implied by this value, as shown by measurements of the Hammett acidity function H (or "effective pH").

According to the classical definition superacid is an acid with an acidity greater than that of 100% pure sulfuric acid, which has a Hammett acidity function (H) of 12.

Other acidity functions have been proposed for different environments, most notably the Hammett acidity function, H, for superacid media and its modified version H for superbasic media.

Although the Hammett acidity function is the best known acidity function, other acidity functions have been developed by authors such as Arnett, Cox, Katrizky, Yates, and Stevens.

The Hammett acidity function is used in fields such as physical organic chemistry for the study of acid-catalyzed reactions, because some of these reactions use acids in very high concentrations, or even neat (pure).