A3-3
APPENDIX 3
A3 MULTIPLE EQUIVALENCE POINTS
A3.1 Applicability Domain
Multiple equivalence point titrations can be used to determine:
• the component concentrations from a synthetic mixture (e.g.: Mixture of HCl,
CH
3
COOH, NH
4
Cl);
• the concentration of a polyprotic acid in its titratable ionization stages (e.g. H
3
PO
4
,
two equivalence points in aqueous medium).
A3.2 Performing a Titration
Set up the method parameters as follows:
• Set the end point mode to equivalence end point (mV or pH).
• Set the number of equivalence points, up to 5 points can be detected.
• Select the end point determination, first or second derivative.
• The rest of the method parameters can be modified (if needed) and save the method.
Note: In the method calculation screen the molecular weight and reaction ratio can be
entered for each point
.
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