Basic_Techniques - Basic Techniques Chemistry 223 Main...

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Basic Techniques Chemistry 223
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Main Points in Basic Techniques Weighing by difference Use of burets Use of pipettes Use of volumetric flasks
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Analytical Balances Accurate to 0.0001 g Keep the doors SHUT when reading. Give the balance a few seconds to settle down once doors are closed. Don’t make a mess.
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Weighing by Difference – to avoid sample contamination and sample loss Step 1 – Weigh the original sample. -.---- g Step 2 – Transfer some sample to the new container. 15.2681 g 14.2157 g Step 3 – Re-weigh the original sample and find the difference. mass initial - mass final = 15.2681 g – 14.2157 g = 1.0524 g
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Finger Cots Protect the bottle from YOU. Only need 3 (see picture) Don’t help a whole lot if dust, dirt, hair, sweat, water, etc. are on the cots.
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Using a Buret Prime Fill Read the initial level Dispense liquid Read the final level
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The Details I To prime a buret: Partially fill with the liquid to be dispensed. Tip the buret and rotate
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This note was uploaded on 01/06/2011 for the course CHEM 223 taught by Professor Scheeline during the Fall '08 term at University of Illinois at Urbana–Champaign.

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Basic_Techniques - Basic Techniques Chemistry 223 Main...

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