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Virtual Titrator: A Student-Oriented Instrument

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David Ritter and Michael Johnson

Department of Chemistry, Southeast Missouri State University, Cape Girardeau, MO 63701

J. Chem. Educ., 1997, 74 (1), p 120

DOI: 10.1021/ed074p120

Publication Date (Web): January 1, 1997

Section:

History, Education, and Documentation

Abstract

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Computer-Based Learning

Keywords (Subject):

Titration / Volumetric Analysis

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

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- Comparing the Titrations of Mixed-Acid Solutions Using Dropwise and Constant-Flow Techniques
  Paul Charlesworth , Matthew J. Seguin and David J. Chesney
  Journal of Chemical Education2003 80 (11), 1311
  A mixed-acid solution containing hydrochloric and phosphoric acids was used to determine the error associated with performing a real-time titration. The results were compared against those obtained by performing the titration in a more traditional ...
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Solving Incomplete Inorganic Chemical Systems through a Fuzzy Knowledge Frame
I. Luque Ruiz, C. Martínez Pedrajas, and M. A. Gómez-Nieto
Journal of Chemical Information and Computer Sciences2001 41 (1), 83-99
- Solving Incomplete Inorganic Chemical Systems through a Fuzzy Knowledge Frame
  I. Luque Ruiz, C. Martínez Pedrajas, and M. A. Gómez-Nieto
  Journal of Chemical Information and Computer Sciences2001 41 (1), 83-99
  A model for the completion and balancing of inconsistent inorganic reactions is presented. A series of fuzzy parameters is proposed. These parameters are considered within a knowledge frame representing inorganic reactions via a semantic/functional ...
  Abstract | Full Text HTML | Hi-Res PDF