Description Usage Arguments Value Author(s) Examples
This function calculates and plots the titration curve for a triprotic weak acid analyte using a monoprotic strong base as the titrant. The calculation uses a single master equation that finds the volume of titrant needed to achieve a fixed pH, as outlined in R. de Levie's Principles of Quantitative Chemical Analysis (McGraw-Hill, 1997).
1 2 3 |
conc.acid |
Molar concentration of the triprotic weak acid analyte; defaults to 0.10 M. |
conc.base |
Molar concentration of the strong base titrant; defaults to 0.10 M. |
pka1 |
The pKa1 value for the triprotic weak acid analyte; defaults to a pKa1 of 4. |
pka2 |
The pKa2 value for the triprotic weak acid analyte; defaults to a pKa2 of 7. |
pka3 |
The pKa3 value for the triprotic weak acid analyte; defaults to a pKa3 of 10. |
pkw |
The pKw (or pKs) value for the solvent; defaults to water as a solvent with a pKw of 14. |
vol.acid |
The initial volume, in mL, of the solution that contains the weak acid analyte; defaults to 50.00 mL. |
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 pH 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 points
ex7 = triwa_sb(eqpt = TRUE)
head(ex7)
### Overlay titration curves using different pKa1 and pKa2 values
triwa_sb(pka1 = 4, pka2 = 7, pka3 = 10, eqpt = TRUE)
triwa_sb(pka1 = 3, pka2 = 7, pka3 = 11, overlay = TRUE)
triwa_sb(pka1 = 5, pka2 = 7, pka3 = 9, overlay = TRUE)
|
volume ph
1 0.02153947 2.51
2 0.08999953 2.52
3 0.15852091 2.53
4 0.22713343 2.54
5 0.29586693 2.55
6 0.36475129 2.56
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