PS-2117
3
012-08470G
6.
While on the Home screen, open the bottom stopcock to
allow titrant to flow.
7.
After about 10 mL of titrant is collected in the graduated
cylinder, close the bottom stopcock.
8.
Record the exact volume from the graduated cylinder.
9.
Build the desired display for you experiment.
10.
Select the
Experiment Tools
button.
Result:
The Experiment Tools screen opens.
11.
Select
Calibrate Sensor
.
Result:
The Calibrate Sensor: Select Measurement screen
opens.
12.
Select the
Sensor:
box and select
Drop Counter
.
13.
Select the
Measurement:
box and select
Fluid Volume
(ml)
.
14.
Select the
Calibration Type:
box and select
1 point
(Adjust Slope Only)
.
15.
Select
NEXT
.
Result:
The Calibrate Sensor screen opens
16.
Under Calibration Point 2 select the
Standard Value:
box and enter the recorded volume (from step 8).
17.
Under Calibration Point 2 select
Read From Sensor.
18.
Select
OK
to exit the Calibrate Sensor screen.
19.
Select
OK
to exit the Experiment Tools screen.
Acid-Base Titration (Calibration Method)
Procedure
1.
Setup the equipment and consumables as shown.
2.
Connect the Drop Counter and pH Sensor to the
PASPORT-compatible interface.
3.
Start the data acquisition software.
4.
Use the software to create a graph of pH vs. Fluid Vol-
ume.
5.
Start the stir plate.
6.
Touch, press, or click to begin recording data.
7.
Open the valve on the bottom stopcock so the titrant
drops fall at about 1 drop per second.
8.
Observe the data on the pH versus Fluid Volume graph.
After the equivalence point is reached, continue collect-
ing data until the pH curve flattens.
9.
Close the stopcock valve and stop data recording.
Acid-Base Titration (Alternative Method)
Procedure
1.
Set up the equipment and consumables as illustrated.
Attach both stopcocks to the syringe, and attach the drop
tip to the bottom stopcock. Line up the drop tip with the
rectangular opening in the Drop Counter.
2.
Start with the valves of the stopcocks turned parallel to
the table top. Add the solutions to the syringe and bea-
ker.
3.
Write down the initial volumes of both solutions (in the
syringe and in the beaker), and the molarity of the titrant
(in the syringe).
4.
Connect the Drop Counter and pH sensor to your
PASPORT compatible PASCO interface (or interfaces).
5.
If you are using a computer, connect the interface to it
and start the data acquisition software. Set up a graph
display of pH versus Drop Count.
6.
Start the stir plate.
7.
Touch, press, or click to begin recording data.
8.
Open the top stopcock. Slowly adjust the bottom stop-
cock to start delivering titrant at about 2 drops per sec-
ond.
Select fluid volume for
horizontal axis.
