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Nitric acid, with a pK value of around −1.7, behaves as a strong acid in aqueous solutions with a pH greater than 1. [23] At lower pH values it behaves as a weak acid. pK a values for strong acids have been estimated by theoretical means. [24] For example, the pK a value of aqueous HCl has been estimated as −9.3.
See Amino acid for the pK a values of all amino acid side chains inferred in such a way. There are also numerous experimental studies that have yielded such values, for example by use of NMR spectroscopy. The table below lists the model pK a values that are often used in a protein pK a calculation, and contains a third column based on protein ...
In the case of multiple pK values they are designated by indices: pK 1, pK 2, pK 3 and so on. For amino acids, the pK 1 constant refers to its carboxyl (–COOH) group, pK 2 refers to its amino (–NH 2) group and the pK 3 is the pK value of its side chain.
Oxalic acid's pK a values vary in the literature from 1.25 to 1.46 and from 3.81 to 4.40. [ 26 ] [ 27 ] [ 28 ] The 100th ed of the CRC, released in 2019, has values of 1.25 and 3.81. [ 29 ] Oxalic acid is relatively strong compared to other carboxylic acids :
This usage is consistent with the common parlance of most practicing chemists.) When the acidic medium in question is a dilute aqueous solution, the H 0 {\displaystyle H_{0}} is approximately equal to the pH value, which is a negative logarithm of the concentration of aqueous H + {\displaystyle {\ce {H+}}} in solution.
I = 0), these curves imply the following stepwise dissociation constants: = = = = Direct values for these constants in the literature include pK 1 = 6.35 and pK 2 - pK 1 = 3.49. [ 21 ] To interpret these numbers, note that two chemical species in an acid equilibrium are equiconcentrated when p K = p H .
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In this one-compartment model, the most common model of elimination is first order kinetics, where the elimination of the drug is directly proportional to the drug's concentration in the organism. This is often called linear pharmacokinetics , as the change in concentration over time can be expressed as a linear differential equation d C d t ...