redox_titration {titrationCurves}

Redox Titration Curve

Description

This function calculates and plots the titration curve for a reducing agent analyte using an oxidizing agent as the titrant. The calculation uses a single master equation that finds the volume of titrant needed to achieve a fixed potential, as outlined in R. de Levie's Principles of Quantitative Chemical Analysis (McGraw-Hill, 1997).

Usage

redox_titration(conc.analyte = 0.01, vol.analyte = 25, pot.analyte = 0.77,
  elec.analyte = 1, conc.titrant = 0.01, pot.titrant = 1.7,
  elec.titrant = 1, plot = TRUE, eqpt = FALSE, overlay = FALSE, ...)

Arguments

conc.analyte

Molar concentration of the analyte; defaults to 0.010 M.

vol.analyte

Initial volume, in mL, of the solution containing the analyte; defaults to 25.00 mL.

pot.analyte

Standard state or formal potential for the analyte's half-reaction in V; defaults to 0.77 V.

elec.analyte

The number, n, of electrons lost by the analyte in its oxidation half-reaction; defaults to 1.

conc.titrant

Molar concentration of the titrant; defaults to 0.010 M.

pot.titrant

Standard state or formal potential for the titrant's half-reaction in V; defaults to 1.7 V.

elec.titrant

The number, n, of electrons gained by the analyte in its reduction half-reaction; defaults to 1.

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 plot() function.

Value

A two-column data frame that contains the volume of titrant in the first column and the solution's potential in the second column. Also produces a plot of the titration curve with options to display the equivalence point and to overlay titration curves.

Author(s)

David T. Harvey, DePauw University. [e-mail]

Examples

### Simple titration curve with equivalence point
ex12 = redox_titration(eqpt = TRUE)
head(ex12)

### Overlay titration curves using different potentials for tirant
redox_titration(pot.titrant = 1.7, eqpt = TRUE)
redox_titration(pot.titrant = 1.5, overlay = TRUE)
redox_titration(pot.titrant = 1.3, overlay = TRUE)