A rapid Method for the Determination of chloride with Potentiometric

A rapid Method for the Determination of Chloride with Potentiometer

Equipment
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0430.100 Ag Titrode; input 1

Reagents
c(AgNO₃) = 0.1 mol/L; D0

Sample
5 mL c(NaCl) = 0.1 mol/L
2 mL c(HNO₃) = 2 mol/L
40 mL dist. Water

Remarks
· Calculations:

Chloride=EP1*C01*C02*C03/C00;2;%
NaCl=EP1*C01*C04/C00;2;g/l

Chloride = content of chloride in %
NaCl = content of NaCl in g/L
C01 = concentration of titrating agent (0.1 mol/L)
C02 = molecular mass of Cl- (35.45 g/mol)
C03 = factor for % (0.1)
C04 = molecular mass of NaCl (58.44)
· Select the appropriate formula. The other may be deleted.
Or change the formula according to your application.

. Answer

Chloride=4.969x0.1x35.45x0.1/5=0.35%
NaCl=4.969x0.1x58.44/5=5.81 g/L

EP1=4.969 mL
C00=5.000 mL

Literature
· Metrohm Application Bulletin No. 130: Chloride titrations with
potentiometric end-point indication.

Method documentation

'pa
751 GPD Titrino 15215 751.0010
DET U Chloride
parameters
>titration parameters
meas.pt.density 4
min.incr. 10.0 ml
dos.rate max. ml/min
signal drift 50 mV/min
equilibr.time 26 s
start V: OFF
pause 0 s
dos.element: internal D0
meas.input: 1
temperature 25.0 °C
>stop conditions
stop V: abs.
stop V 99.99 ml
stop U OFF mV
stop EP 1
filling rate max. ml/min
>statistics
status: OFF
>evaluation
EPC 5
EP recognition: all
fix EP1 at U OFF mV
pK/HNP: OFF
>preselections
req.ident: OFF
req.smpl size: all
activate pulse: OFF
------------
rfm
751 GPD Titrino 15215 751.0010
DET U Chloride
>calculations

Chloride=EP1*C01*C02*C03/C00;2;%
NaCl=EP1*C01*C04/C00;2;g/l
C00= 5.0
C01= 0.1
C02= 35.45
C03= 0.1
C04= 58.44
------------
'fr
751 GPD Titrino 15215 751.0010
U(init) 192 mV DET U Chloride
smpl size 5.0 ml
EP1 4.969 ml 33 mV
Chloride 0.35 %
NaCl 5.81 g/l
stop #EP reached
============
'cu
751 GPD Titrino 15215 751.0010
start V 0.000 ml DET U Chloride
2.0 ml/div dU=50.0 mV/div
============