TABLE OF CONTENTS In your notebook, prepare a worksheet like the one shown in Table 4.3. For this exercise you need:
Analytical balance reading to 0.0001 g (0.1 mg).
25 cm 3 glass bulb pipette (Class B).
100 cm 3 beaker.
Thermometer 0 to 100 C, reading to 0.1 C.
Distilled or deionised water (about 200 cm 3) in a conical flask.
Paper towel.
| Date | ||
| Balance checked and found OK | yes | no |
| Pipette checked for cleanliness and absence of chips | yes | no |
| Pipette filler function checked and found OK | yes | no |
| Thermometer function checked and found OK | yes | no |
| Results: | ||
|---|---|---|
| weight of nominal | calculated volume | |
| ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 ________cm 3 | Water temperature: |
| Total ________cm 3 | ||
| Standard deviation ( s) ________________cm 3 (for an individual measurement) | ||
| Mean ________________cm 3 | ||
| Uncertainty is expressed as standard deviation or relative standard deviation (%) (= standard deviation 100/mean) | ||
| The manufacturer's uncertainty for the 25 cm 3 pipette ( m) = cm 3 | ||
| Combined... |
