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Percent Error

Calculating mistakes in measurements.

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Practice Percent Error
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Calculating Percent Error

Percent Error

Recall: Percent Error= ( |Experimental Value- Known Value| / Known Value ) x 100

Credit: user: Twisp
Source: http://commons.wikimedia.org/wiki/File:Czochralski_method_crucibles.jpg
License: CC BY-NC 3.0


Brian is heating an unknown hydrate in a crucible over a bunsen burner. After fifteen minutes over the bunsen burner, he removes the heat under the crucible and lets it sit overnight. The next day, he masses the crucible with left over solid and finds the mass of the water of hydration to be 2.7 g. Later he is asked by his teacher to calculate the percent error of his lab given that the known value of the mass of the water of hydration for that specific hydrate is 3.2 g.

Creative Applications

1. Calculate Brian’s percent error.

2. What could be possible sources of error contributing to this?

3. Why shouldn’t have Brian left the crucible out over night?

Image Attributions

  1. [1]^ Credit: user: Twisp; Source: http://commons.wikimedia.org/wiki/File:Czochralski_method_crucibles.jpg; License: CC BY-NC 3.0

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