Exp2_prelab

Exp2_prelab - Scientific Measurement and Error Introduction...

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Unformatted text preview: Scientific Measurement and Error Introduction to scientific glassware and basic laboratory techniques. To understand the importance of precision and accuracy in scientific measurements. To learn about different types of experimental error. Analytical Equipment Provides accurate and precise measurements Glassware marked as TC (to contain) or TD (to deliver) Indicates that the glassware has been calibrated Examples: balance, buret, pipet, volumetric flask Qualitative Equipment Generally used as storage devices Beakers, Erlenmeyer flask NEVER use for volume measurements Some errors are more obvious than others, but there is error associated with EVERY measurement Acceptable sources of error can be quantified Human error or mistakes cannot be quantified and therefore are unacceptable forms of error Repeat an experiment to fix human error Instrumental Limitations: uncertainties are inherent in any measuring instrument Examples: A ruler, even if as well-made as is technologically possible, has calibrations of finite width Calibrations are made under certain conditions, which have to be reproduced if the calibrations are to be true. Volumetric glassware is usually calibrated for 20oC and the laboratory is usually at some other temperature....
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Exp2_prelab - Scientific Measurement and Error Introduction...

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