Metrohm 719 S Titrino - Manual (Page 139)

6.3 User methods
719 S Titrino
135
6.3.3 "Tit.NaOH"
Titer determination of NaOH using PHP.
The titer is calculated as a factor without di-
mension out of 5 determinations and stored
as common variable C37. It can therefore be
used directly by subsequent methods.
Electrode:
6.0232.100 combined glass pH electrode, at
measuring input 1.
Titrant:
c(NaOH) = 0.1 mol/L (free of carbonate)
Sample:
Weigh in potassium hydrogen phtalate (PHP),
dried 2 h at 105 °C.
Sample size according to the buret volume.
Dilute in 40 mL dist. Water (free of carbonate).
Reference:
METROHM Application Bulletin Nr. 206:
– Result (Titer) as a digit without dimension
– Sample size of PHP in g
– Theoretical consumption for 1 mol PHP
– Molar mass PHP
C37 is the common variable for the titer
c(NaOH) = 0.1 mol/L.
'pa
719 S Titrino 18200 719.0021
date 2002-03-13 time 12:44 0
SET pH Tit.NaOH
parameters
>SET1
EP at pH 8.65
dynamics 3
max.rate 5 ml/min
min.rate 0.5 µl/min
stop crit: drift
stop drift 20 µl/min
>SET2
EP at pH OFF
>titration parameters
titr.direction: auto
pause 1 0 s
start V: rel.
factor 35
dos.rate max. ml/min
pause 2 5 s
extr.time 0 s
meas.input: 1
temperature 25.0 °C
>stop conditions
stop V: abs.
stop V 99.99 ml
filling rate max. ml/min
>statistics
status: ON
mean n= 5
res.tab: original
>preselections
conditioning: OFF
req.ident: OFF
req.smpl size: value
activate pulse: OFF
------------
'fm
719 S Titrino 18200 719.0021
date 2002-03-13 time 12:44 0
SET pH Tit.NaOH
>calculations
Titer=C00*C01/C02/EP1;4;
C00= 1.0
C01= 10000
C02= 204.23
------------
'de
719 S Titrino 18200 719.0021
date 2002-03-13 time 12:44
SET pH Tit.NaOH
def
>formula
Titer=C00*C01/C02/EP1
RS1 text Titer
RS1 decimal places 4
RS1 unit:
>common variables
C37=MN1
>report
>mean
MN1=RS1
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