Description Usage Arguments Value Author(s) Examples
This function calculates and plots the titration curve for a metal ion analyte using EDTA as the titrant. The calculation uses a single master equation that finds the volume of titrant needed to achieve a fixed concentration of the metal ion, pM, as outlined in R. de Levie's Principles of Quantitative Chemical Analysis (McGraw-Hill, 1997).
1 2 3 |
conc.metal |
Molar concentration of the metal ion analyte; defaults to 0.10 M. |
conc.edta |
Molar concentration of the EDTA titrant; defaults to 0.10 M. |
vol.metal |
Initial volume, in mL, of the solution that contains the metal ion analyte; defaults to 50.00 mL. |
ph |
The pH of the solution, which is used to calculate the fraction of EDTA present in its fully deprotonated form; defaults to a pH of 10. |
logkf |
The log of the formation constant, Kf, for the metal-EDTA complex; defaults to 8.79, which is the value for the complex of Mg2+ and EDTA. |
alpha.metal |
The fraction of the metal ion analyte that is not complexed by an auxilary complexing agent; defaults to 1, the value when there is no secondary complexing agent present. |
plot |
Logical; if TRUE, plots the titration curve. |
eqpt |
Logical; if TRUE, draws a vertical line at the titration curve's equivalence point. |
overlay |
Logical; if TRUE, adds the current titration curve to the existing titration curve. |
... |
Additional arguments to pass to |
A two-column data frame that contains the volume of titrant in the first column and the solution's pMetal in the second column. Also produces a plot of the titration curve with options to display the equivalence point and to overlay titration curves.
David T. Harvey, DePauw University. harvey@depauw.edu
1 2 3 4 5 6 7 8 | ### Simple titration curve with equivalence point
ex11 = metal_edta(eqpt = TRUE)
head(ex11)
### Overlay titration curves using different pH values
metal_edta(ph = 12, eqpt = TRUE)
metal_edta(ph = 10, overlay = TRUE)
metal_edta(ph = 8, overlay = TRUE)
|
volume p.metal
1 0.5756209 1.01
2 1.1510891 1.02
3 1.7262525 1.03
4 2.3009588 1.04
5 2.8750565 1.05
6 3.4483946 1.06
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