Question

g The tolerance of a Class A 50 mL transfer pipet is ±0.05 mL. A student uses an uncalibrated Class A transfer pipet to deliver a total of 150 mL of solution. What is the uncertainty in the delivered 150 mL? Note: tolerance is different from the uncertainty, so it does not follow the propagation formula of errors

Answer 1

Uncertainty of tolerance transfer pipet = ± 0.15

Volume of liquid between = 149.85, 150.15

Given:

Size of transfer pipet = 50 ml

Tolerance transfer pipet = ± 0.05 ml

Total transfer = 150 ml

Find:

Uncertainty of tolerance transfer pipet

Computation:

Uncertainty of tolerance transfer pipet = [150 / 50](± 0.05)

Uncertainty of tolerance transfer pipet = [3](± 0.05)

Uncertainty of tolerance transfer pipet = ± 0.15

Volume of liquid between = (150-0.15), (150+0.15)

Volume of liquid between = 149.85, 150.15