Two Safe Student Conductivity Apparatus

Katz, David A.; Willis, Courtney

doi:10.1021/ed071p330

Cited by 8 publications

(6 citation statements)

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“…In fact, the potential usefulness of conductometric titration as a routine laboratory technique was proposed in textbooks over twenty years ago (8). Moreover, the basic principles behind related conductometric titration apparatus have been published in this Journal (9)(10)(11)(12)(13)(14). In light of the rapidly increasing interest in the use of biomacromolecules for a broad spectrum of practical applications, in the present work, we describe an 'easy-to-use' conductometric titration method to quantify the charge density of biomacromolecule polyelectrolytes.…”

Section: This Article Focuses On Conductometric Titration a Titratiomentioning

confidence: 99%

“…It is a well-established analytical method for simple acid–base systems , and has recently been applied to analyze biological molecules for various purposes. − In addition, conductometric measurements are routinely conducted in the pulp and paper industry to assess the mechanical performance of paper by absorption of additives onto the fiber surface, the deposition of colloidal materials, such as small cellulose fragments and filler particles; or when stoichiometric neutralization of anionic trash is required. , The potential usefulness of conductometric titration as a routine laboratory technique has been proposed in textbooks over 20 years ago . Moreover, the basic principles behind related conductometric titration apparatus have been described in this Journal . − …”

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confidence: 99%

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Charge Density Quantification of Polyelectrolyte Polysaccharides by Conductometric Titration: An Analytical Chemistry Experiment

Farris

Mora

Capretti³

et al. 2011

J. Chem. Educ.

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We present an easy analytical method for determination of the charge density of polyelectrolytes, including polysaccharides and other biopolymers. The basic principles of conductometric titration, which is used in the pulp and paper industry, as well as in colloid and interface science, were adapted to quantify the charge densities of a negatively charged polysaccharide (pectin) and a positively charged biopolymer (chitosan): two biomacromolecules commonly used in food and biomaterials applications. We demonstrate that this novel conductometric titration method can be easily applied in most analytical chemistry teaching laboratories, due to its ease-of-use, safety, and educational benefits. This analytical technique can be used in a wide-range of laboratory activities, and has extensive research applications in areas of chemistry involving charged biopolymers, such as food science, materials science and physical chemistry.

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Section: This Article Focuses On Conductometric Titration a Titratiomentioning

confidence: 99%

mentioning

confidence: 99%

Charge Density Quantification of Polyelectrolyte Polysaccharides by Conductometric Titration: An Analytical Chemistry Experiment

Farris

Mora

Capretti³

et al. 2011

J. Chem. Educ.

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“…Explorations of the concept of conductivity are also common in the undergraduate chemistry curriculum, and various articles reporting on novel aspects of conductivity have appeared in this Journal . These reports include the construction of conductivity meters − , as well as conductivity experiments exploring kinetics , , equilibrium , mechanisms , , structure , micelles , and polymers .…”

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confidence: 99%

Conductimetric Titrations: A Predict−Observe−Explain Activity for General Chemistry

Smith¹,

Edionwe²,

Michel³

2010

J. Chem. Educ.

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A predict−observe−explain framework is used to explore conductimetric titrations of a hydrochloric acid−sodium hydroxide (strong acid−strong base) and an acetic acid−sodium hydroxide (weak acid−strong base) system in which all components are soluble. In the strong acid−strong base system, the conductivity decreases as the titration progresses to the equivalence point and then increases past the equivalence point. In the weak acid−strong base system, the conductivity increases as the titration progressed to the equivalence point and then increases at a greater rate past the equivalence point. In another more sensitive titration of the weak acid−strong base system, the conductivity initially decreases slightly, then increases as the titration progresses to the equivalence point, and then increases at a greater rate past the equivalence point. These characteristic conductimetric titration curves are analyzed and explained.

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“…Because of the high cost of instrumentation, quantitative measurements of conductivity are rarely performed in general chemistry laboratories. As a substitute, many instructors construct homemade devices that rely on a battery and LED for qualitative observations − . A homemade device that makes quantitative measurements of conductivity has been described .…”

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confidence: 99%

Exploring Fundamental Concepts in Aqueous Solution Conductivity: A General Chemistry Laboratory Exercise

2010

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Two Safe Student Conductivity Apparatus

Abstract: Design, construction, and application of two conductivity apparatus.

Cited by 8 publications

References 1 publication

Charge Density Quantification of Polyelectrolyte Polysaccharides by Conductometric Titration: An Analytical Chemistry Experiment

Charge Density Quantification of Polyelectrolyte Polysaccharides by Conductometric Titration: An Analytical Chemistry Experiment

Conductimetric Titrations: A Predict−Observe−Explain Activity for General Chemistry

Exploring Fundamental Concepts in Aqueous Solution Conductivity: A General Chemistry Laboratory Exercise

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