equipment list

Question 1

Volumetric or standard flask (Class B)

Answer 1

• A 250 cm3 volumetric flask has an uncertainty of ±0.2 cm3 or 0.08%

Question 2

Pipette (Class B)

Answer 2

• A 25 cm3 pipette has an uncertainty of ±0.06 cm3 or 0.24%.

Question 3

When using apparatus with an analogue graduated scale,

Answer 3

the uncertainty is assumed to be
± half the smallest graduation. For example, for a burette graduated in divisions of 0.1 cm3
,
the uncertainty in each measurement is ±0.05 cm3
.