Hanna Instruments HI 901 - Manual (Page 75)

5-35
METHODS
If the titrant 1 unit is selected as M (mol/L), titrant 2 unit is selected as M (mol/L) and the
final result unit as mg/g (milligrams/gram) the following formula is used to calculate the
amount of titrant 1 (used in the first stage of back titration or direct titration) and will be as
follows:
The formula is based on an approximation: the sample concentration is 100% w/w.
With this approximation, the titrator will calculate the volume of titrant 1 needed to consume
the sample and multiply it with an excess factor in order to raise or to lower the amount of
titrant 1 dispensed.
Some variables can be set according to the amount of sample and titrant 1 used.
When the parameters from the formula are set, press
to proceed with the next
formula used in the back titration algorithm.
If you do not want to use the “Calc. Direct Titr. Volume” formula, then from the View / Modify
Method screen:
• highlight the Titrant 1 Entry option, press .
• highlight Fixed Weight or Volume option and press , you will be prompted to
type the volume of titrant 1 to be dispensed in the first stage of back titration.
This formula is used to calculate the remaining volume of titrant 1 after the reaction with the
sample.