Hach-Lange TITRALAB 840_845 Reference Manual - Manual (Page 143)

Titra Lab ® TitraLab 840 and 845 Reference Manual
Page 143
Reaction X Smp
+ Y Exc Enter stoichiometric coefficients for the reaction between the sample
and the titrant in excess when the following units have been selected:
• Excess titrant unit (M, mM),
or
• Titrant unit (M, mM)
To determine the X and Y stoichiometric coefficients:
The reaction is: X Smp + Y Exc ->
where:
• 1 mole of titrant gives X eq of titrant in excess
• 1 mole of sample gives Y eq of sample
To balance the reaction, Y mole(s) of excess titrant are required to
titrate X mole(s) of sample.
Example:
Titrant in excess
sodium hydroxide (NaOH). 1 mole of NaOH gives 1 eq of NaOH.
Sample
citric acid (C
3
H
5
0 (COOH)
3
). 1 mole of citric acid gives 3 eq of citric
acid.
3 NaOH +1 C
3
H
5
O(COOH)
3
-> C
3
H
5
0 (COONa)
3
+ 3H
2
O
Enter
Reaction = 1 Smp + 3 Exc ->
Enter in:
Edit method > Results
Range available:
(1 to 20) Smp + (1 to 20) Exc ->
When you enter the coefficients of X Smp + Y Exc ->, please
also check the coefficients of the X Exc + Y Titr -> equation (line
below in the Results screen).
Y of Titr is always equal to X of Smp: it may be necessary to
change the X coefficient of the X Exc + Y Titr -> equation.
Refer to "Appendix 3: Result calculations", page 205 .