Learning Goal: To be able to identify specific types of error in the laboratory Learning Goal: To be able to calculate percent error from measurements when given an accepted value. Types of Error in Laboratory Measurements. Error in the Lab.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Learning Goal: To be able to identify specific types of error in the laboratory
Learning Goal: To be able to calculate percent error from measurements when given an accepted value
There is always a measure of error with measurements.
Due to a mistake that is the direct fault of the scientist
(ex. Typing a number in wrongly on the calculator, not reading meniscus at eye level, copying the balance reading wrongly, not recording to the correct number of sig figs)
- Not acceptable in a lab report because they can be immediately fixed
Error due to a faulty procedure or design
Examples: using a bunsen burner instead of a hot water bath caused the temperature to move upwards too quickly; not using a magnetic stirrer caused the solution not to completely dissolve
Error due to a measuring instrument not being calibrated correctly.
Ex: a clock set 5 minutes fast, a balance that records 5 g less than the actual mass
Note: reading the instrument incorrectly or recording the wrong number of sig figs is an operator error, not an instrumental error