|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2000
>
October
> |
|
Information • Textbooks • Media • Resources
|
|
Computer Bulletin Board
|
|
Comparisons and Demonstrations of Scientific Calculators
|
Myung-Hoon Kim
Department of Sciences, Georgia Perimeter College, Dunwoody Campus, Dunwoody, GA 30338-4497
Suw-Young Ly
Department of Fine Chemistry, Seoul National University of Technology, Seoul 139-743, Korea
Tae-Kee Hong
Department of Chemistry, Hanseo University, Seosan, Choongnam 356-820, Korea
|
|
October 2000
Vol. 77 No. 10
p. 1367
|
|
|
|
|
|
|
| Abstract |
|
Scientific calculators are classified into four types: Basic, Intermediate, Advanced-I, and Advanced-II. They are compared in terms of their capacities, featuring many advantages of the graphic calculator over simple nongraphic calculators. Built-in software packages with the advanced calculators include graphing programs, an equation solver with numerical methods, matrix algebra for solving simultaneous equations, and advanced statistics including a nonlinear least squares regression. Applications in this paper include a simulation of acid-base titration curves, and graphic display of a time course of concentrations of reactants and products for a chemical reaction with first-order kinetics. Ready demonstrations of graphic results from a quantitative chemical problem are particularly advantageous with the advanced graphic calculators.
|
| Supplement |
Acid-Base Titration Curve with a Graphic Calculator
This is a source program to generate an acid-base titration curve with the model TI-85 graphing calculator. Helpful explantions are given in parentheses. Some editing or minor modifications might be necessary to be useful for other types of calculators from different manufacturers.
| :ClDrw |
clear a previous drawing on the screen |
| :0.00 |
-> |
xMin |
set a lower limit for the volume of the base, VB |
| :50.0 |
-> |
xMax |
set an upper limit for the volume of the base |
| :5.00 |
-> |
xScl |
tick marks in the x-axis for the volume |
| :0.00 |
-> |
yMin |
set a lower limit for the pH |
| :14.0 |
-> |
yMax |
set an upper limit for the pH |
| :1.00 |
-> |
yScl |
tick marks in the y-axis for the pH |
| :25.0 |
-> |
VA |
input of the volume of the acid |
| :0.100 |
-> |
MA |
input of the concentration of the acid |
| :0.100 |
-> |
MB |
input of the concentration of the base |
| :10E-14 |
-> |
KW |
input of the ion-product of water |
| :CA=MA*VA/(VA+x) |
calculate total concentration of the acid in the mixture at any time during the titration) |
| :CB=MB*x/(VA+x) |
calculate total concentration of the base in the mixture |
:PH=-log(0.5((CA-CB)+
((CA-CB)2+4KW)^0.5)) |
calculate pH according to the general formula |
| :y1=PH |
store the calculated pH values into an array of variable y1 |
| :DrawF y1 |
draw a function y1 |
| :End |
Notes:
- TI-80, TI-81, TI-82, and TI-83 do not allow a variable name with two charactors. Thus , MA, MB, VA, CA, CB , KW and PH must be changed to a single character such as M, N, V, A, B, K and P, respectively for those TI models.
- Values for MA, MB, and VA can be readily changed to other values if titration at other conditions are desired.
- This work and other related work with graphic calcualtors were presented at the 14th Biennial Conference on Chemical Education, Clemson University, Clemson, SC, August 4-8, 1996.
(tit_asc.htm, 10/98, animated, MHK)
|
 Contents |
|
| Download |
|
|
| More Information |
Citation |
Kim, Myung-Hoon; Ly, Suw-Young; Hong, Tae-Kee. J. Chem. Educ. 2000 77 1367.
|
Keywords |
Acid-Base Chemistry; Graphic Calculator; Kinetics; Teaching / Learning Aids; Titration; Computer Assisted Instruction
|
History |
Created:
Last Updated: |
September 22, 2000
August 31, 2005
|
|
|
|
|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2000
>
October
> Page
1367
|
|
|
| JCE HS CLIC |
|
Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
|
| Contributions Welcome |
| JCE welcomes your submission |
| Advertisers |
| In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first. |
| Be An Ambassador |
| Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants. |
|
