Hach-Lange TITRALAB 840_845 Reference Manual - Manual (Page 205)

Titra Lab ® TitraLab 840 and 845 Reference Manual
Page 205
Appendix 3: Result calculations
Titration ends with determination of several volumes, corresponding to the different equivalent
points: Vepi.
The blank volumes are Bi.
Calculations are based on these volumes and you determine with which volume (or which
equivalent point) you want to work. In fact, in a method, you can have at least as much results
as equivalent points, but it is possible to have less by choosing the desired equivalent point.
Moreover, with several equivalent points, you can choose to work with the cumulated or the
subtracted volumes (volumes between equivalences).
1. Volume determination
This volume determination does not apply for the volume calculation in the back titration mode
concerning the blank option.
2. Direct titration
If sample is expressed in volume:
If sample is expressed in weight:
- Vi: volume of titrant at the equivalence (ml)
- C
reag
: titrant concentration
- Vs: sample volume in ml
- ms: sample amount in g
- c: conversion factor
with:
T: titrant of concentration 1 mol/l = x eq/l of titrant
Smp: sample of concentration 1 mol/l = y eq/l of sample
Cumulated volume Subtracted volume
Normal V1 = Veq1
Vi = Veqi V1 = Veq1
Vi = Veqi - Veq(i-1)
With
blank For EP titration: Vi = Veqi - Bi
For IP titration and B applied to eq2:
V1 = Veq1
V2 = Veq2 - B
Vi = Veqi - B For EP titration: Vi = Veqi - Veq(i-1) - Bi
For IP titration and B applied to eq2:
V1 = Veq1
V2 = Veq2 - Veq1 - B
Vi = Veqi - Veq(i-1)
Csmp
Vi Creag
×
Vs
---------------------------- c
×
=
Csmp
Vi Creag
×
m s
---------------------------- c
Ч
=