Acid–Base Equilibria in Amphiprotic Solvents and Potentiometric Titration

1972 ◽  
Vol 41 (11) ◽  
pp. 975-990 ◽  
Author(s):  
L N Bykova ◽  
S I Petrov
Keyword(s):  
Potentiometric Titration ◽  
Acid Base

Surface Behaviour of β-FeOOH: Point of Zero Change and Interactions with Anions and Cations

1986 ◽  
Vol 3 (2) ◽  
pp. 89-94 ◽  
Author(s):  
K. M. Parida
Keyword(s):  
Potentiometric Titration ◽  
Electrical Double Layer ◽  
Aqueous Suspension ◽  
Zero Point ◽  
Monovalent Cations ◽  
Addition Method ◽  
Acid Base ◽  
Solution Interface ◽  
Zero Point Of Charge ◽  
Anions And Cations

The acid-base dissociation behaviour of the surface of β-FeOOH in aqueous suspension has been investigated by potentiometric titration. The zero point of charge of the electrical double layer of the oxide/solution interface (pH = 7·6 ± 0·1 in KNO3, NaNO3 and LiNO3 electrolytes) coincides with the pH of the isoelectric point, determined by the solid addition method. Chloride and sulphate anions are strongly adsorbed on the β-FeOOH surface and thus modify the balance of positive and negative groups on the surface. The sequence of interaction of monovalent cations with the surface is K+ = ≤ Na+ ≤ Li+. β-FeOOH appears to behave essentially in the same manner as found previously for α-FeOOH.

New approach in the treatment of data from an acid–base potentiometric titration

2002 ◽  
Vol 375 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Vania Maslarska ◽  
Jasmina Tencheva ◽  
Omortag Budevsky
Keyword(s):  
Potentiometric Titration ◽  
Acid Base ◽  
New Approach

scholarly journals USING POTENTIOMETRIC ACID-BASE TITRATION TO DETERMINE PKA FROM MANGOSTEEN PERICARPS EXTRACT

2019 ◽  
Vol 16 (32) ◽  
pp. 768-773
Author(s):  
L. TANIA ◽  
C. DIAWATI ◽  
M. SETYARINI ◽  
N. KADARITNA ◽  
A. SAPUTRA
Keyword(s):  
Oxalic Acid ◽  
Potentiometric Titration ◽  
Accurate Determination ◽  
Acidity Constant ◽  
Equivalence Point ◽  
Acid Base ◽  
Titrant Volume ◽  
Acid Base Titration ◽  
Ph Range

One of the uses of acid-base indicators is to show the end point of the titration, so the accurate determination of acidity constant and pH range of indicators needs to be done. This study aims to determine the acidity constant (pKa) of mangosteen pericarp extract and its accuracy as an indicator of acid-base titration. Determination of pKa was done by a simple potentiometric titration method. The titration data were plotted in three graphs, i.e., pH, ΔpH/ΔV (the (the first derivative), and Δ2pH/ΔV2 (the second derivative) versus titrant volume to determine the equivalence point of the titration. The accuracy test was carried out by comparing the volume of oxalic acid used to titrate NaOH solution using the indicator of mangosteen pericarp extract and phenolphthalein indicator. The result showed that the equivalence point was found on the titrant volume of 8.6 mL and a measured pH of 9.84. so the pKa value of mangosteen pericarp extract was 7.20, and the pH range was 6.20 to 8.20. the average volume of oxalic acid used to titrate 5 mL of NaOH using phenolphthalein as the indicator was 5.2 mL while the titration used mangosteen pericarp extract was 5.23 mL. The accuracy of mangosteen pericarp extract was 99.42%. By the result, it can be concluded that potentiometric titration can be used as a simple way to determine the acidity constant of mangosteen pericarp extract. Moreover, the mangosteen pericarp extract can be used as an alternative acid-base titration indicator to substitute the common acid-base titration in the laboratory.

scholarly journals Pitfalls and Uncertainties of Using Potentiometric Titration for Estimation of Plant Roots Surface Charge and Acid-Base Properties

2014 ◽  
Vol 05 (13) ◽  
pp. 1862-1876 ◽  
Author(s):  
Grzegorz Jozefaciuk ◽  
Alicja Szatanik-Kloc ◽  
Malgorzata Lukowska ◽  
Justyna Szerement
Keyword(s):  
Surface Charge ◽  
Potentiometric Titration ◽  
Plant Roots ◽  
Acid Base ◽  
Base Properties

scholarly journals Acid-base properties of fibrous polyampholytes with aminodiacetic functional groups

2020 ◽  
Vol 64 (3) ◽  
pp. 300-307
Author(s):  
E. G. Kosandrovich ◽  
P. V. Nesteronok ◽  
L. N. Shachenkova ◽  
V. S. Soldatov
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Potentiometric Titration ◽  
Functional Groups ◽  
Supporting Electrolyte ◽  
Experimental Results ◽  
Monochloroacetic Acid ◽  
Polyacrylonitrile Fiber ◽  
Acid Base ◽  
Amination Reaction

Polyampholytes, containing aminodiacetic functional groups, on the base of polyacrylonitrile fiber Nitron C were obtained by the amination reaction of nitrile groups with polyamines (number of repeating units from 1 to 5) and subsequent alkylation with monochloroacetic acid. The experimental results of potentiometric titration and sorption of supporting electrolyte (kCl) ions by synthesized ion exchangers were obtained, which made it possible to determine the acidity parameters of functional groups: the presence of four types of cation exchange and two types of anion exchange groups was detected in polyampholytes, the sequence of their neutralization in the titration process was established.

scholarly journals Effect of Grafted Hydroquinone on the Acid-Base Properties of Poly(acrylic acid) in the Presence of Copper (II)

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Nabila Bensacia ◽  
Saâd Moulay ◽  
François Garin ◽  
Ioana Fechete ◽  
Anne Boos
Keyword(s):  
Acrylic Acid ◽  
Coordination Number ◽  
Potentiometric Titration ◽  
Stability Constants ◽  
Acid Base ◽  
Polymer Complexes ◽  
Ionic Environment ◽  
The Stability ◽  
Hasselbalch Equation ◽  
Poly Acrylic Acid

Potentiometric titration of poly(acrylic acid) and hydroquinone-functionalized poly(acrylic acid) was conducted in the presence of copper (II). The effects of hydroquinone functionalizing and copper (II) complexing on the potentiometric titration of poly(acrylic acid) were studied in an ionic environment and in its absence. Henderson-Hasselbalch equation was applied to assess its validity for this titration. Coordination number and the stability constants of the copper- (II-)complexed polymers were determined, and results showed the formation of mostly monodentate and bidentate copper- (II-)polymer complexes.

Sign in / Sign up

Export Citation Format

Share Document