Related Experiment Video
Updated: Jun 28, 2026
06:18
Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
Published on: April 24, 2018
3-methyl-2-oxazolidone as a solvent for acid-base titrations
J E Taphorn1, G M Davies, J A Caruso
1Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, USA.
Talanta
|July 1, 1975
Summary
3-Methyl-2-oxazolidone is an effective solvent for titrating weak acids and phenols. Its properties allow for accurate acid strength determination and potential differentiation of acid mixtures.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
Background:
- Solvent selection is crucial for accurate potentiometric titrations.
- Weak acids and phenols often require specialized solvent systems for effective analysis.
Purpose of the Study:
- To evaluate 3-Methyl-2-oxazolidone as a solvent for potentiometric titration of weak acids and phenols.
- To determine the relative acid strengths and compare them to aqueous acidity.
- To assess the potential for differentiating titrations in this solvent medium.
Main Methods:
- Potentiometric titration using a glass-calomel electrode system.
- Titration of weak carboxylic acids and phenols with tetrabutylammonium hydroxide.
- Analysis of results using FORTRAN computer programs.
Main Results:
- 3-Methyl-2-oxazolidone exhibits excellent solvent properties due to its high dielectric constant and wide liquid range.
- Accurate determination of acid strengths was achieved, comparable to other solvent media.
- An 800-mV potential span was observed, indicating potential for differentiating titrations.
- Distinct neutralization steps were observed for salicylic acid and o-phthalic acid.
Conclusions:
- 3-Methyl-2-oxazolidone is a viable and effective solvent for the potentiometric titration of weak acids and phenols.
- The solvent's properties support accurate acidity measurements and suggest potential for analyzing complex acid mixtures.
- Further investigation into differentiating titrations of acid mixtures is warranted.
Related Concept Videos
01:16Titration in Nonaqueous Solvents
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
02:11Leveling Effect and Non-Aqueous Acid-Base Solutions
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
01:17Solution Composition During Acid/Base Titrations
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values represent the...
The α0 and α1 values represent the...
03:55Titration Calculations: Weak Acid - Strong Base
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
01:18Titration of Polyprotic Base with a Strong Acid
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
01:08Titration of a Weak Acid with a Weak Base
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
As a result, there is no simple...