Percent Yield Notes Chemistry | Lecture Note

University:
High School
Course:
High School Chemistry
Academic year:

2025
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2
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Percent Yield Experimental Yields ● Not all chemical reactions go as planned ○ Spills and other human errors ○ Uncontrolled environmental conditions ○ Incomplete reactions ○ Undesirable side reactions ● Chemists need a measurement to indicate how successful a reaction has been Theoretical vs. Actual Yield ● Theoretical yield: ○ The max. amount of product that could be formed from the fiven amounts of reactants ● Actual yield: ○ Amount of product actually formed when the reaction is carried out in a lab ● Percent yield: ○ To compare these numbers, a ratio of actual to theoretical yields, expressed as a percentage Percent Yield ● Very important in the manufacturing of products ○ Time and money are spent improving the percent yield for chemical production ○ When complex chemicals are synthesized by many different reactions, just one reaction with a low percent yield can cause a large waste of reactants ● Formula: ● Typically percent yields are less than 100% ● Percent yields greater than 100% are possible if the product contains impurities that cause the mass to be greater than the pure product would be ● Very important to make sure reactants and products are purified to eliminate impurities