Question

If a titration net volume should be 20. 00 ml and a student accidentally goes one drop past the endpoint (~0. 05 ml). What is his percent error?

Answer 1

If a titration net volume should be 20. 00 ml and a student accidentally goes one drop past the endpoint (~0. 05 ml),then the percent error is 0.25%.

What is percent error?

Percent error is defined as the difference of experimental value and theoretical value and measures the accuracy of the result found. The greater the error, lesser is the accuracy and vice versa.

Volume of a drop

Vd = 1mL/20 drops

where,

Vd is volume of one drop

Vd = 0.05mL

Calculation of error

Error is defined as the ratio of change in volume divided by real volume.

e(%) = {(Vr-Vt) /Vt}×100

where,

Vr = real volume

Vd = theoretical volume

e(%) = {((20+0.05) -20) /20} × 100

e(%) = 0.25%

Thus, we find that the percent error on adding one drop is 0.25%.

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