Hanna Instruments HI934 Bedienungsanleitung Seite 134
Karl fischer coulumetrischer titrator
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5.2.6. MULTIPLE ENDPOINT TITRATION
Some titrations have two or more endpoints, each corresponding to the equivalence point for a specific reaction. Multiple
endpoint titrations are similar to a blank titration in that the volume of titrant required to reach the first endpoint is
subtracted from the titrant volume used to reach the next sequential endpoint.
C
Sample 1 Concentration (g/100g)
sample1
C
Sample 2 Concentration (g/100g)
sample2
C
Sample 3 Concentration (g/100g)
sample3
V
Volume of titrant required to reach the first endpoint (L)
titrant1
V
Volume of titrant required to reach the second endpoint (L)
titrant2
V
Volume of titrant required to reach the third endpoint (L)
titrant3
C
Concentration of titrant (N)
titrant
Ratio
Equivalence ratio of analyte/titrant (mol analyte/eq titrant)
FW
Formula Weight of the Analyte 1 (g/mol)
analyte1
FW
Formula Weight of the Analyte 2 (g/mol)
analyte2
FW
Formula Weight of the Analyte 3 (g/mol)
analyte3
m
Mass of Sample (g)
sample
5.2.7. BACK TITRATION
The equation used in back titration calculations is also similar to the equation for a blank titration. Instead of subtracting
the initial amount of titrant needed to react with the blank, the amount of second titrant needed to react with the excess
titrant added in the first titration is subtracted from the amount of the first titrant added. The difference between the two
amounts is the amount of titrant necessary to reach the first equivalence point.
C
Sample Concentration (g/100mL)
sample
C
Concentration of titrant 1 (N)
titrant1
V
Volume of titrant 1 (L)
titrant1
C
Concentration of titrant 2 (N)
titrant2
V
Volume of titrant 2 (L)
titrant2
Ratio
Equivalence ratio of analyte/titrant (mol analyte/ eq titrant)
FW
Formula Weight of the analyte (g/mol)
analyte
V
Volume of sample (mL)
sample
4-20
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