![Page 1: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/1.jpg)
eTitratorThe Online Titration Calculator
Kevin NgoDepartment of Chemistry
Central Washington UniversitySOURCE, May 2014
![Page 2: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/2.jpg)
Concepts Chemical Equilibrium
General Chemistry Acid Base Titration
Confusing and Difficult Calculations
Introduction
![Page 3: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/3.jpg)
Currently Implemented Future• Interface• Simple Input• Advanced Input• Graphical Visualization of
Titration• General Chemistry pH
Calculation• Strong Titrant• Strong and Weak Analytes • Monoprotic and Polyprotic
Acids
• Interface• Cell phones and
Tablets• Step by Step Tutorial• Problem Generator
Features
![Page 4: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/4.jpg)
Software Up-to-date Web Browsers
Operating System Windows Mac Linux/UNIX iOS/Android
Platform Requirements
![Page 5: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/5.jpg)
Application Programming Interface
Titration System
Acid-Base
HTML
Titration Wrapper
Complexometric
Redox
Real Life EquivalencepH Meter
Indicator
Potentiometer
Abstraction
Representative
User Interaction
![Page 6: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/6.jpg)
General Approach Before titrant is added Buffer region(s) At equivalence point(s) Beyond equivalence point (titrant in excess)
Approximations Hiccups where it should be smooth
Calculation Method
![Page 7: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/7.jpg)
Calculation Method (cont.)
Is Analyte Strong?
Weak Analyte Calculations
Strong Analyte Calculations
Yes
No
Buffer
Equivalence Point
Titrant in Excess
![Page 8: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/8.jpg)
Situation Equation
Some Equations Used
𝑝 𝐻=− log ¿¿Strong Acid in Excess
Buffer Region
Henderson-Hasselbalch Equation 𝑝𝐻=𝑝𝐾𝑎+ log( [𝐵𝑎𝑠𝑒 ]
[ 𝐴𝑐𝑖𝑑 ] )
Pure Weak Acid𝑝𝐻=
𝑝𝐾 𝑎− log ( [ 𝐴𝑐𝑖𝑑 ] )2
![Page 9: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/9.jpg)
1M HCl vs 1M NaOH1M NaOH vs 1M HAc4M NaOH vs 4M H3PO4
Demonstration
NaOH vs H3PO4
![Page 10: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/10.jpg)
Expanded Titration FunctionsAccurate pH Titrations (done w/ Fortran)Redox, Gas Phase, and Complexometric Titrations
First step towards an answer engine for chemistryTitrationThermodynamic PropertiesKinetic Mechanisms such as Michaelis-Menton mechanismSpectrum Analysis: UV-Vis, IR, Raman, NMR, and Mass Spectrum
Future Work
![Page 11: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/11.jpg)
Physical Chemistry III class and Dr. Yingbin Ge’s Research Group
Department of Chemistry
Acknowledgements
![Page 12: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/12.jpg)
Harris, D. C. (2010). Quantitative chemical analysis (8th ed.).
New York: W.H. Freeman and Co..
McQuarrie, D. A., & Rock, P. A. (2011). General chemistry (4th
ed.). Mill Valley, CA: University Science Books.
References
![Page 13: ETitrator The Online Titration Calculator Kevin Ngo Department of Chemistry Central Washington University SOURCE, May 2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d835503460f94a69dcc/html5/thumbnails/13.jpg)
Questions and Comments?