The ionization constants of p-Aminobenzoic Acid in Aqueous solution at 25°C

1957 ◽  
Vol 10 (2) ◽  
pp. 128 ◽  
Author(s):  
RA Robinson ◽  
AI Biggs
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Ionization Constants ◽  
Aminobenzoic Acid ◽  
Zwitterion Formation

The ionization constants of benzoic acid and of four esters of p-aminobenzoic acid, as well as the two ionization constants of p-aminobenzoic acid itself, have been deter- mined by spectrophotometric measurements. The extent of zwitterion formation in p-aminobenzoic acid is discussed.

Acid-Base Relationships and Tautomeric Equilibria in m-Aminobenzoic Acid, 3-Amino-1-naphthoic Acid, and 4-Amino-2-naphthoic Acid

1961 ◽  
Vol 14 (2) ◽  
pp. 237 ◽  
Author(s):  
A Bryson ◽  
RW Matthews
Keyword(s):  
Aqueous Solution ◽  
Methyl Esters ◽  
Ionization Constants ◽  
Aminobenzoic Acid ◽  
Naphthalene Ring ◽  
Acid Base ◽  
Tautomeric Equilibria ◽  
Naphthoic Acid

The first and second ionization constants have been determined in aqueous solution of m-aminobenzoic acid, 3-amino-1-naphthoic acid, and 4-amino-2-naphthoic acid. From published values of the ionization constants for the methyl esters, the ionization constants have been evaluated for the four equilibria involved in each case and estimates have been made of the effects of the substituents NH3+ and NH2 on the ionization of the COOH, and of the substituents COOH and COO- on the ionization of the NH3+ group. These values and the tautomeric constants are interpreted in terms of structure and are discussed in relation to previous studies on substitution in the naphthalene ring.

THE IONIZATION CONSTANTS OF p-NITROPHENYLACETIC AND PHENYLMALONIC ACIDS

1933 ◽  
Vol 8 (5) ◽  
pp. 447-449 ◽  
Author(s):  
Steward Basterfield ◽  
James W. Tomecko
Keyword(s):  
Benzoic Acid ◽  
Nitro Group ◽  
Malonic Acid ◽  
Phenylacetic Acid ◽  
Ionization Constants ◽  
Side Chain ◽  
Cooh Group ◽  
Conductivity Data ◽  
Nitrobenzoic Acid ◽  
Phenylmalonic Acid

The ionization constants of p-nitrophenylacetic and phenylmalonic acids have been determined from conductivity data. The value of K for p-nitrophenylacetic acid at 25 °C. is 1.04 × 10−4, about twice that of phenylacetic acid. The nitro group in the nucleus has not as powerful an effect on the ionization when the COOH group is in the side chain as it has when both nitro group and COOH are in the nucleus. K for p-nitrobenzoic acid is six times as great as K for benzoic acid. K for phenylmalonic acid is 2. 77 × 10−3 as compared with 1.6 × 10−3 for malonic acid.

Molecular Sinkers: X-ray Photoemission and Atomistic Simulations of Benzoic Acid and Benzoate at the Aqueous Solution/Vapor Interface

2012 ◽  
Vol 116 (43) ◽  
pp. 13017-13023 ◽  
Author(s):  
Niklas Ottosson ◽  
Anastasia O. Romanova ◽  
Johan Söderström ◽  
Olle Björneholm ◽  
Gunnar Öhrwall ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Atomistic Simulations ◽  
Vapor Interface ◽  
X Ray

THE ACIDITY OF SOME AROMATIC FLUORO ALCOHOLS AND KETONES

1960 ◽  
Vol 38 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Ross Stewart ◽  
R. Van der Linden
Keyword(s):  
Aqueous Solution ◽  
Nitro Compounds ◽  
Ionization Constants

A series of five trifluoroacetophenones and five phenyl trifluoromethyl carbinols have been synthesized and their ionization constants in water measured. They are the unsubstituted, p-methoxy, p-methyl, m-bromo, and m-nitro compounds. The ketones exist as hydrates in aqueous solution and each is about two pK units stronger than the corresponding alcohol. The acidities of both series are correlated by the Hammett relation with ρ values of 1.11 and 1.01 for the ketone hydrates and alcohols respectively. The acid strengths vary from a pKa of 9.18 for m-nitro-α,α,α-trifluoroacetophenone to 12.24 for p-methoxyphenyl trifluoromethyl carbinol.

Synthetic NiO catalyst‐assisted peroxymonosulfate for degradation of benzoic acid from aqueous solution

2020 ◽  
Author(s):  
Xiaowei Huo ◽  
Peng Zhou ◽  
Jing Zhang ◽  
Chenmo Wei ◽  
Yunxin Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid

Efficient sorption of Pb(ii) from an aqueous solution using a poly(aniline-co-3-aminobenzoic acid)-based magnetic core–shell nanocomposite

2016 ◽  
Vol 40 (3) ◽  
pp. 2521-2529 ◽  
Author(s):  
Ehsan Nazarzadeh Zare ◽  
Moslem Mansour Lakouraj ◽  
Atefeh Ramezani
Keyword(s):  
Aqueous Solution ◽  
Water Treatment ◽  
Magnetic Core ◽  
Magnetic Nanocomposite ◽  
Core Shell ◽  
Aminobenzoic Acid ◽  
Treatment Processes ◽  
Poly Aniline

We propose that the PA3ABA@Fe3O4 core–shell magnetic nanocomposite is an appropriate candidate for water treatment processes.

Study on the Supramolecular Interaction of Dibenzoyl Peroxide(BPO) and ß-Cyclodextrin(ß-CD) by Spectrophtometry and its Analytical Application

2012 ◽  
Vol 554-556 ◽  
pp. 27-30
Author(s):  
Hui Xie ◽  
Yan Min Wang
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Benzoic Acid ◽  
Supramolecular Interaction ◽  
Guest Complex ◽  
Host Guest Complex ◽  
Molecule Recognition ◽  
Excellent Selectivity ◽  
Principal Advantage ◽  
Dibenzoyl Peroxide

The supramolecular interaction of BPO and ß-CD has been studied by spectrophtometry. The mechanism of the inclusion was studied. The results showed that ß-CD react with BPO to form a 2:1 or 1:1 host-guest complex.The ß-CD reacts with benzoic acid to form a 1:1 host-guest complex after the BPO was reduced by hydroxyl ammonium chloride.Based on the enhancement of the absorbance of BPO produced through complex formation, a spectrophotometric method for determination BPO in bulk aqueous solution in the presence of ß-CD was developed. A linear relationship between the absorbance and BPO concentration was obtained in the range of 0.2～50 μg.ml-1. The proposed method was used to determine the BPO in the flour with satisfactory results. The principal advantage of the proposed method is its excellent selectivity based on molecule recognition of ß-CD and simple.

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