Hanna-instruments HI 901 Manual de usuario Pagina 75

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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.
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