1. Measuring small volumes
June 2013
Paul Beaumont

2. [Evaluating experimental procedures p. 50]
Learners should be able to…: …
identify sources of error in measurements and observations
identify and comment on the reliability of results
...

3. Skills of scientific experimentation, investigation and enquiry
Evaluating (p 8)
Learners should be able to…: …
identify sources of error in measurements and observations
identify and comment on the reliability of results
...

4. Syringes / pipettes Variable volume 0 - 20 μL, 0 - 200 μL, 0 - 1000 μL
~ £200 per syringe

5. Syringes / pipettes Single volume
5 μL, 10 μL, 20 μL, 25 μL, 50 μL and 100 μL
£16 per syringe

6. Making your own microsyringe
Accuracy?
Precision?
Cost?

7. Equipment

8. Equipment
10 mL
20 mL
50 mL
100 mL
200 mL

9. Operation / activity Draw up some air - ~ 100 mL No more than 200 mL!
Measure mass of empty weighing boat
Take ca. 150 mL - expel excess until 100 mL left
Repeat 9 times - measure mass
Record mass on board
Repeat using 50 mL increments