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Unformatted text preview: About Percent Yield in the Organic Laboratory Definitions: Theoretical Yield: The maximum amount of product if ALL of the limiting reagent reacted exactly as described by the balanced equation, with no losses due to side reactions or spillage. Percent Yield: The amount of purified product obtained, divided by the theoretical yield. A Percent Yield over 100% is physically impossible -- as far as we know, you cannot create matter...if you do, please let your instructor know right away so we can nominate you for the next Nobel Prize in chemistry!! Crude Percent Yield: Percent yield of the crude product before purification. This crude material may contain product, starting material, byproducts from side reactions, moisture, and a variety of other impurities. Therefore this number may be over 100%. The amounts of such impurities are more characteristic of the technical details of the operation or the technical skill level of the operator than the nature of the reaction itself, so this number is rarely published in the chemical literature. Purified Percent Yield: See Percent Yield....
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This note was uploaded on 03/26/2008 for the course CHEM 141 taught by Professor Freistad during the Spring '08 term at University of Iowa.
- Spring '08