Measurement in the Laboratory

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Presentation transcript:

Measurement in the Laboratory Proper Techniques Explained

Precision Vs. Accuracy

Precision Vs. Accuracy

Tools Used in Lab Analytical balance Striker Mortar and pestle Ring stand Beaker Erlenmeyer flask Bunsen burner Graduated cylinder Clamp Funnel Stirring rod Pipette Tongs Watch glass

Analytical balance

Striker

Mortar and Pestle

Ring Stand

Beaker

Erlenmeyer Flask

Stirring Rod

Funnel

Clamp

Bunsen Burner

Graduated Cylinder

Tongs

Watch Glass

Crucible

Buret

Pipette

Graduated Cylinder

Tools for Lab Measurement Ruler Graduated Cylinder Thermometer Two-Pan or Triple-Beam Balance

A Note About Precision You must look at the effective range and increments of measurements on the instrument you are using.

Thermometers What are the increments? How much can you safely estimate? 40 60 55 50 45 5 9 8 7 6 -30 10 -10 -20 0.4 0.3 0.2 0.1

Pan Balances What are the increments? How much can you safely estimate? 40 50 60 70 80 90 100 110 120 130 140 150 1 2 3 4 5 6 7 8 9

Rulers What are the increments? How much can you safely estimate? A B D E F G H I J K L M N 1 2 3 4 5 6 7 8 9

Graduated Cylinders What are the increments? How much can you safely estimate? 40 60 55 50 45 5 9 8 7 6 -30 10 -10 -20 0.4 0.3 0.2 0.1