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General analytical procedure for determination of acidity parameters of weak acids and bases.

Pilarski B, Kaliszan R, Wyrzykowski D, Młodzianowski J, Balińska A - J Anal Methods Chem (2015)

Bottom Line: The paper presents a new convenient, inexpensive, and reagent-saving general methodology for the determination of pK a values for components of the mixture of diverse chemical classes weak organic acids and bases in water solution, without the need to separate individual analytes.The data obtained from simple pH-metric microtitrations are numerically processed into reliable pK a values for each component of the mixture.Excellent agreement has been obtained between the determined pK a values and the reference literature data for compounds studied.

View Article: PubMed Central - PubMed

Affiliation: Cerko Sp. z o.o. Sp.K, Al. Zwycięstwa 96/98, 81-451 Gdynia, Poland.

ABSTRACT
The paper presents a new convenient, inexpensive, and reagent-saving general methodology for the determination of pK a values for components of the mixture of diverse chemical classes weak organic acids and bases in water solution, without the need to separate individual analytes. The data obtained from simple pH-metric microtitrations are numerically processed into reliable pK a values for each component of the mixture. Excellent agreement has been obtained between the determined pK a values and the reference literature data for compounds studied.

No MeSH data available.


Related in: MedlinePlus

Titration and fitted curves pH = f(VNaOH) obtained for mixture of PhA, Py-4CA, and MA with mole ratio of acids 1 : 2 : 2.
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fig2: Titration and fitted curves pH = f(VNaOH) obtained for mixture of PhA, Py-4CA, and MA with mole ratio of acids 1 : 2 : 2.

Mentions: The representative pH titration curves for the mixture of carboxylic acids PhA : Py-4CA : MA are presented in Figures 1 and 2. Compositions of titrand D for the mixture (PhA : Py-4CA : MA) were as follows: 1 : 1 : 1, 1 : 2 : 1, 1 : 2 : 2, and 1 : 1 : 1 with 0.5 mole ratio of HCl. The titration and fitted curves pH = f(VNaOH) obtained for mixture with molar ratio of the components 1 : 2 : 2 (PhA : Py-4CA : MA) are shown in Figure 2. The pKa data determined for the mixtures of carboxylic acids under study are listed in Tables 3 and 4.


General analytical procedure for determination of acidity parameters of weak acids and bases.

Pilarski B, Kaliszan R, Wyrzykowski D, Młodzianowski J, Balińska A - J Anal Methods Chem (2015)

Titration and fitted curves pH = f(VNaOH) obtained for mixture of PhA, Py-4CA, and MA with mole ratio of acids 1 : 2 : 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4321670&req=5

fig2: Titration and fitted curves pH = f(VNaOH) obtained for mixture of PhA, Py-4CA, and MA with mole ratio of acids 1 : 2 : 2.
Mentions: The representative pH titration curves for the mixture of carboxylic acids PhA : Py-4CA : MA are presented in Figures 1 and 2. Compositions of titrand D for the mixture (PhA : Py-4CA : MA) were as follows: 1 : 1 : 1, 1 : 2 : 1, 1 : 2 : 2, and 1 : 1 : 1 with 0.5 mole ratio of HCl. The titration and fitted curves pH = f(VNaOH) obtained for mixture with molar ratio of the components 1 : 2 : 2 (PhA : Py-4CA : MA) are shown in Figure 2. The pKa data determined for the mixtures of carboxylic acids under study are listed in Tables 3 and 4.

Bottom Line: The paper presents a new convenient, inexpensive, and reagent-saving general methodology for the determination of pK a values for components of the mixture of diverse chemical classes weak organic acids and bases in water solution, without the need to separate individual analytes.The data obtained from simple pH-metric microtitrations are numerically processed into reliable pK a values for each component of the mixture.Excellent agreement has been obtained between the determined pK a values and the reference literature data for compounds studied.

View Article: PubMed Central - PubMed

Affiliation: Cerko Sp. z o.o. Sp.K, Al. Zwycięstwa 96/98, 81-451 Gdynia, Poland.

ABSTRACT
The paper presents a new convenient, inexpensive, and reagent-saving general methodology for the determination of pK a values for components of the mixture of diverse chemical classes weak organic acids and bases in water solution, without the need to separate individual analytes. The data obtained from simple pH-metric microtitrations are numerically processed into reliable pK a values for each component of the mixture. Excellent agreement has been obtained between the determined pK a values and the reference literature data for compounds studied.

No MeSH data available.


Related in: MedlinePlus