Virtual Titrator:: A Student-Oriented Instrument
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David Ritter [1] ; Michael Johnson [1]
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[1] Southeast Missouri State University
Southeast Missouri State University
Township of Cape Girardeau, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 74, Nº 1 (January), 1997, págs. 120-123
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Two virtual instruments have been constructed in our physical chemistry laboratory. The first is a virtual autotitrator based on an Orion pH meter, a 386 CPU computer, and a homemade stepper-motor driven syringe. A graphical user interface written in Visual Basic allows the user to control the system with simple mouse clicks. The program automatically set up a link to a Quattro Pro for Windows spreadsheet and puts each pH value and number of steps into the proper spreadsheet cells. The user manipulates the data in the spreadsheet to generate first and second derivative curves to determine the endpoint, and produce the graphical output. The second is a stopped-flow spectrometer interfaced to a 386 CPU computer which uses a virtual oscilloscope program written in Visual Basic to collect and display the data. Students use a spreadsheet to manipulate the data and compare fits to simple models.
