1.2 Development of a method
799 GPT Titrino: Getting started
3
1.2 Development of a method
You learn how to elaborate a method .
First you select a titration mode. A general survey of the
different titration modes is given on page 12.
Selecting the mode
<MODE>
<
←
> or <
→
>
<ENTER>
<START>
<STOP>
Press the <MODE> key.
Select the mode DET with <
←
> or <
→
> keys, press
<ENTER>, select the measured quantity "pH" and press
<ENTER> again.
DET stands for
D
ynamic
E
quivalence point
T
itration. In
this titration, the size of the volume increments vary as a
function of the slope of the titration curve. After each
increment, a preset measured value drift (or time) is
awaited until the next increment is added (so called
"equilibrium titration"). After the titration, the equivalence
points are evaluated automatically.
You are now ready to titrate. You titrate with the internal
dosing unit D0, i.e. the Exchange Unit on the Titrino.
Mount an Exchange Unit with NaOH, c=0.1 mol/L on the
Titrino.
Plug a combined pH glass electrode into measuring
input ("Ind I").
Pipette 2 mL HCI, c =0.1 mol/L into the titration vessel,
dilute it with ca. 20 mL. dist. water, adjust the stirrer and
press <START>.
During the titration the titration curve is displayed. To the
left of the curve, the current measured values (pH and
volume) are displayed.
As soon as the Titrino has found an equivalence point, it
will also be shown the left.
Let the titration continue for a short while, e.g. until ca.
pH=11.50. Now stop it with <STOP>.
The equivalence point is displayed.
DET pH D0a ********
mode
mode: DET
measured quantity: pH
DET pH D0a ********
EP1 2.083 ml pH 7.64
