Calculate Percent Yield in Chemistry Experiments
Learn how to calculate percent yield in chemistry experiments by understanding theoretical yield, actual yield, and efficiency. Practice problems provided for better understanding.
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Presentation Transcript
Percent Yield pg. 89
Percent Yield When you determine the amount of product from a balanced chemical equation you are finding the theoretical yield rarely do scientists get the theoretical yield in the lab, we measure the actual yield need to know the efficiency-- determine percent yield
Calculating percent yield percent yield= actual yield (from lab) / theoretical yield (from calculations) x 100 expressed as a percent
Example When potassium chromate (K2CrO4) is added to a solution containing 0.500 g silver nitrate, solid silver chromate (Ag2CrO4) is formed. determine the theoretical yield of the silver chromate precipitate if 0.455 g of silver chromate is obtained, calculate the percent yield.
Practice Problems Aluminum hydroxide is often present in antacids to neutralize stomach acid (HCl). If 14.0 g aluminum hydroxide is present in an antacid tablet, determine the theoretical yield of aluminum chloride produce when the tablet reacts with stomach acid. If the actual yield of aluminum chloride from this tablet is 22.0 g, what is the percent yield? Al(OH)3+3HCl --> AlCl3+3H2O
