Comparing the Titrations of Mixed-Acid Solutions Using Dropwise and Constant-Flow Techniques

Charlesworth, Paul; Seguin, Matthew J.; Chesney, David

doi:10.1021/ed080p1311

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…The analysis and determination of the base/acid mixture is an important experimental project in the course of Analytical Chemistry. , The double-indicator method is commonly employed for analyzing the composition of base or acid mixtures, such as the Na 2 HPO 4 /Na 3 PO 4 system, and the NaOH/Na 2 CO 3 /NaHCO 3 system. , Among them, the measurement of carbonate mixtures is the most widely used in the school as a teaching experiment due to its feasibility. In industry, Na 2 CO 3 or NaOH is widely used for adjusting pH, since Na 2 CO 3 absorbs CO 2 and water from the air, and converts to NaHCO 3 , while NaOH absorbs CO 2 , and converts to Na 2 CO 3 .…”

Section: Introductionmentioning

confidence: 99%

Prelaboratory Practice with a Titration Simulation Program for Carbonate Mixtures

Fu,

Yang

et al. 2024

J. Chem. Educ.

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The double-indicator method is often used in the analysis of Na 2 CO 3 , NaHCO 3 , and NaOH mixtures (carbonate mixtures). In this method, the determination of the volumes at the first and second equivalence points plays a crucial role in analyzing the composition and content of the carbonate mixtures. Here, LabVIEW software was used to create a virtual titration simulation program, which can simulate the titration and the distribution fraction plots to help students in comprehending the titration process as well as facilitate the exploration of the relationship between the volumes of the first and second equivalence points for various components within the mixture. The program also includes a "Test" function that assesses students' comprehensive abilities in quantitatively analyzing the components in the mixture. The students achieved a score rate of 76.2%. The questionnaire survey indicates that the majority of students believe the program effectively enhances their understanding of the principles behind double indicator method and the process of mixtures' titration. Furthermore, they feel that the program boosts their confidence in performing real experiments.

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Section: Introductionmentioning

confidence: 99%

Prelaboratory Practice with a Titration Simulation Program for Carbonate Mixtures

Fu,

Yang

et al. 2024

J. Chem. Educ.

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“…Much has been published on the subject of acid–base titrations and their educational use. In the past decade, specifically, several articles and letters were published in this Journal . − From an analytical point of view, a titration is a counting of the average number of analyte particles in solution through the reaction with a known number of standard particles . To be used in titrimetry, an acid–base reaction must come close to completion and textbooks usually emphasized that the technique cannot be applied to the accurate determination of the concentration of very weak acids using conventional equivalence point detection.…”

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confidence: 99%

The Acid–Base Titration of a Very Weak Acid: Boric Acid

Azevedo

Cavaleiro

2012

J. Chem. Educ.

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A laboratory experiment based on the titration of boric acid with strong base in the presence of D-mannitol is described. Boric acid is a very weak acid and direct titration with NaOH is not possible. An auxiliary reagent that contributes to the release of protons in a known stoichiometry facilitates the acid−base titration. Students obtain the potentiometric titration curves of boric acid with standard NaOH in the absence and in the presence of different quantities of mannitol. The results are used for the determination of boric acid concentration and for the discussion of the possibility of performing the titration with a visual end-point determination, including the influence of the quantity of mannitol in solution. The experiment was developed for an introductory analytical chemistry course, but may be extended to an advanced analytical course with the inclusion of a more detailed theoretical treatment. The experiment may be adapted to general chemistry course as an example of a nontrivial titration.

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Students’ Achievement in Learning Chemistry Through the Design and Construction Approach to Laboratory Activity and the Relation with their Prior Achievements and Motivation to Learn

Vrtačnik

Sodja

Juriševič

2014

Learning With Understanding in the Chemistry Classroom

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Comparing the Titrations of Mixed-Acid Solutions Using Dropwise and Constant-Flow Techniques

Cited by 9 publications

References 15 publications

Prelaboratory Practice with a Titration Simulation Program for Carbonate Mixtures

Prelaboratory Practice with a Titration Simulation Program for Carbonate Mixtures

The Acid–Base Titration of a Very Weak Acid: Boric Acid

Students’ Achievement in Learning Chemistry Through the Design and Construction Approach to Laboratory Activity and the Relation with their Prior Achievements and Motivation to Learn

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