To calibrate drops so that a precise volume of titrant is recorded
in
units of milliliters:
1. |
After you have set up the sensor, choose Calibrate -> DIG 1: Drop Counter (mL) from the Experiment menu. |
2. |
Select the Automatic button. |
3. |
Place a 10 mL graduated cylinder directly below the slot on the Drop Counter, lining it up with the tip of the reagent reservoir. |
4. |
Open the bottom valve on the reagent reservoir (vertical). Keep the top valve closed (horizontal). |
5. |
Click the Start button. |
6. |
Slowly open the top valve of the reagent reservoir so that drops are released at a slow rate (~1 drop every two seconds). You should see the drops being counted on the computer screen. |
7. |
When the volume of titrant in the graduated cylinder is between 9 and 10 mL, close the bottom valve of the reagent reservoir. |
8. |
Enter the precise volume of titrant (read to the nearest 0.1 mL) in the edit box. Record the number of Drops / mL displayed on the screen for possible future use. |
9. |
Click OK. Discard the titrant in the graduated cylinder as indicated by your instructor and set the graduated cylinder aside. |
See Also: