The pKa of an amino acid depends upon its type, group and side chains. For example, when lysine is part of the carboxylic acid group, it has a pKa of 2.18, compared to a pKa of 8.95 when it is part of the amino group and... More »

Francis A. Carey's "On-Line Learning Center for Organic Chemistry" provides three distinct pKa values. The pKa for the a-carboxyl group is 1.82. The pKa for the a-ammonium ion is 9.17. The pKa for the side chain is 6.00. More » Science Chemistry Acids & Bases

The pka values of carbonic acid are 6.3 for carbonic (I) and 10.3 for carbonic (II). Carbonic (I) has the molecular formula of H2CO3 while carbonic (II) has the molecular formula of HCO3-. More »

The pKa for phosphoric acid is 2.15 for the first dissociation, 7.20 for the second dissociation and 12.35 for the third dissociation. These values are based on an ambient temperature of 25 degrees Celsius, and are known... More »

The pKa of benzoic acid is equal to approximately 4.20. The pKa value is a measure of the acidity of a substance, with lower values indicating a stronger acid. More » Science Chemistry Acids & Bases

Several carboxylic acids exist with different pKa values. The simplest carboxylic acid, acetic acid, has a pKa value of 4.7. A carboxylic acid is an organic compound containing the functional group COOH. Additional carbo... More »

The pKa of sulfuric acid is -3. This value corresponds to a Ka of 1.0 x 10^3 as the pKa is the negative logarithm of the Ka value. Sulfuric acid is considered a strong acid because the Ka is larger than 1. More »