Determination of pka

As is evident, the smaller the pKa number, the stronger the acid.

Pka determination methods ppt

Furthermore, it was possible to predict the pKa value for each outgoing proton in the DHB structure, which was explained based on donor of electron density EDG or electron density withdrawing group EWG of each substituent in the DHB structure. In this framework, the knowledge of pKa is useful to explain the differences in the reactivity of DHBs compounds in their metallic complexing and subsequent activity in AOPs and biological systems. Therefore, for the 4-chlorocatechol and 1,2,4-benzenetriol, the first deprotonation of hydroxyl groups was OHm. The pKa that provides the best fit is taken to be the measured pKa. Testa et al 4 Timbrell JA. As is evident, the smaller the pKa number, the stronger the acid. The pKa of a compound influences properties such as logD and solubility as well as the absorption, distribution, metabolism, elimination and potency of a compound. Also, it was possible to calculate the pKa2 for nordihydroguaiaretic acid through computational calculation, which was not possible to determine experimentally due to limitations of the technique. Conclusion In this work, an experimental validated computational method was implemented in aqueous solution for pKa determination of different DHBs, which are high value compounds and have had a great attention for its use as versatile platforms for the design of different materials.

Figure 4 shows that the calculated pKa values exhibited good accuracy with those pKa determined experimentally. Also, it is well-known for its metal ligands properties with pro-oxidant and antioxidant performance in biological systems.

determination of pka by potentiometric titration slideshare

VM and DC wrote the manuscript. This is followed by a general summary of the historical development and current state of the techniques of pKa determination and an attempt to develop insight into future developments. The other graphs are 2D projections showing change in absorbance vs.

Knowledge of the aqueous solubility of the sample helps in designing the experiment and avoids unnecessary use of the compound in repeat experiments. Protein binding — Binding of drugs to plasma proteins tends to be by hydrophobic and electrostatic interactions.

Determination of pka

It has been noted that 4-chlorocatechol and 1,2,4-benzenotriol do not conform to this trend. Although the solution becomes opaque during stirring, the pH electrode continues to measure pH of the aqueous component of the solution.

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How to Calculate pKa Values