Orgo Lab Report 1 - Unknown Solids and Liquid
Essay by Brandon Burris • April 3, 2017 • Lab Report • 2,592 Words (11 Pages) • 2,910 Views
Experiment 1: Identification of 2 Unknown Solids and a Liquid
Objective:
One of the objectives of this experiment was to become familiarized with techniques and equipment regularly used in Organic Chemistry. The main objectives of this lab include dissolving, purifying, and recrystallizing an unknown “crude” solid at both the macro and micro levels to determine its identity and to also determine the identity of an unknown liquid by finding its boiling point at the micro level.
Procedure/Observations:
Acquire approximately 1.00 g of one unknown “crude” solid. Place sample in 125-mL Erlenmeyer flask. |
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Find a rough melting point of the sample using a Mel-Temp Apparatus and melting point tube, recording range (1st recording when sample begins to melt and final recording when sample is completely melted). Use this range to make a hypothesis about what the unknown is. |
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Determine a good solvent for recrystallization (0.10g solid + 3mL of solvent). Heat (no flames), cool, and ice-water bath to see crystals. If no solvent works may have to use mixed-solvent. |
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After selecting appropriate solvent, heat solvent and add to solid in Erlenmeyer flask. Filter any impurities through gravity filtration. Activated Charcoal may be used to filter out any discoloration that should NOT be present. |
[pic 2]
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Allow flask (with dissolved solid and solvent) to cool and put in ice bath to allow for crystallization. Agitate with glass rod if no crystals form. |
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Filter crystals with Buchner funnel and vacuum. Use Water trap with Water Aspirator (water all the way on). |
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Allow crystals to dry and take weight. |
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Find the melting point (RANGE) for the pure sample. |
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The above steps should be repeated for the microscale unknown. With the exception of using a smaller amount and a Hirsch funnel instead of a Buchner funnel. |
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For the liquid unknown, the boiling point is found by using the microscale method (Siwoloboff’s method). Repeat 3 times. Use boiling point ranges found to determine the unknown’s identity. |
[pic 4]
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Use another Physical property to determine identity of unknown. |
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