Automated spectrophotometric titrations

Olsen, Eugene D.; Foreback, Craig C.

doi:10.1021/ed049p206

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…Only one of these utilized endpoint detection by absorbance measurements, but with a colored indicator . There have been relatively few reports of spectrophotometric endpoints involving the analyte or titrant as the chromophore , .…”

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confidence: 99%

Coulometric Titration of Ethylenediaminetetraacetate (EDTA) with Spectrophotometric Endpoint Detection: An Experiment for the Instrumental Analysis Laboratory

2011

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Ethylenediaminetetraacetate (EDTA) is commonly used as an anticoagulant in blood-collection procedures. In this experiment for the instrumental analysis laboratory, students determine the quantity of EDTA in commercial collection tubes by coulometric titration with electrolytically generated Cu2+. The endpoint is detected spectrophotometrically using a UV−vis spectrophotometer equipped with a fiber optic probe. Students gain experience with two instrumental methods and learn about a practical application of complexation chemistry.

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confidence: 99%

Coulometric Titration of Ethylenediaminetetraacetate (EDTA) with Spectrophotometric Endpoint Detection: An Experiment for the Instrumental Analysis Laboratory

2011

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“…The quantification of unknowns using spectrophotometric analysis is undoubtedly of paramount importance in chemical analysis. It incorporates a wide range of teaching applications, including, for example, titrations, , analysis of multicomponent mixtures, , equilibrium constants, , and ionization potential . Although fundamental to the understanding of such analysis, instruction on the underlying three physical phenomena of reflectance, transmittance, and absorbance may be overlooked in the process of achieving learning outcomes related to the quantification of unknown concentrations.…”

Section: Introductionmentioning

confidence: 99%

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

Heider,

Stucki,

Hill

et al. 2024

J. Chem. Educ.

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Recent research has demonstrated the unambiguous positive effects of active learning in a variety of college-level courses. We report the implementation and assessment of a 50 minute active-learning in-class activity to conceptualize light absorbance, reflectance, and transmittance, coupled with a writing-to-learn exercise. The activity is suitable in a classroom setting using portable hand-held sensors and samples, including textiles and food-dye solutions. The assessment of the activity included a quasi-experimental design, in which 116 students in an introductory university chemistry course completed the activity, with outcomes compared to a different section, including 322 students, without the active-learning exercise. To determine the efficacy of the activity, students' written reports and exam assessment items relating to reflectance, transmittance, and absorbance were evaluated. With the assessment questions showing statistically significant improvement, it was concluded that the hands-on activity was effective in helping the students better understand the relationships among the three properties of light.

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“…Titrations are an integral component of chemistry laboratory curricula, but are frequently criticized as tedious and laborious (1)(2)(3). A variety of approaches have been taken toward automating titrators for the undergraduate laboratory (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). This paper describes the construction of a simple, versatile automatic titrator used in a senior undergraduate analytical and instrumental chemistry laboratory.…”

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confidence: 99%

A Simple Laboratory-Constructed Automatic Titrator

2000

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The construction of a simple automatic titrator is described. The buret is replaced with a metering pump to provide a constant flow of titrant. The output from the pH meter is sent to a recorder via a laboratory-constructed differentiator, allowing the results to be plotted as potential versus time, first or second derivative. The pump and recorder are plugged in to a standard power bar; turning the power bar on and off starts and stops the titration. Results obtained with the automatic titrator for the titration of sodium carbonate with HCl are as good as or better than those obtained with manual titration or commercial autotitrators.

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Automated spectrophotometric titrations

Cited by 7 publications

References 5 publications

Coulometric Titration of Ethylenediaminetetraacetate (EDTA) with Spectrophotometric Endpoint Detection: An Experiment for the Instrumental Analysis Laboratory

Coulometric Titration of Ethylenediaminetetraacetate (EDTA) with Spectrophotometric Endpoint Detection: An Experiment for the Instrumental Analysis Laboratory

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

A Simple Laboratory-Constructed Automatic Titrator

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