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Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Recrystallization A student was tasked with purifying acetanilide (melting temperature of 114 - 116 °C) from a mixture in lab. The original mixture contained 22% sand, as well as an unknown amount of other impurities. The initial mass of their mixture was 0.543 g. The student chose water as their recrystallization solvent, and dissolved their sample in 10.5 mL of boiling water. They added 0.055 g of activated charcoal to their solution and boiled it for 5 minutes. They then filtered their hot solution, removing the charcoal, and allowed the filtrate to cool on ice for 10 minutes during which they observed recrystallization in their flask. They isolated this solid via vacuum filtration and fuily dried their product. Afterwards, they found they had recovered 0.256 grams of product, and determined the melting temperature of their product to be 108 - 112 °C. Calculate the % recovery for this students' procedure. Was their final product pure? How do you know?
Transcribed Image Text:Recrystallization A student was tasked with purifying acetanilide (melting temperature of 114 - 116 °C) from a mixture in lab. The original mixture contained 22% sand, as well as an unknown amount of other impurities. The initial mass of their mixture was 0.543 g. The student chose water as their recrystallization solvent, and dissolved their sample in 10.5 mL of boiling water. They added 0.055 g of activated charcoal to their solution and boiled it for 5 minutes. They then filtered their hot solution, removing the charcoal, and allowed the filtrate to cool on ice for 10 minutes during which they observed recrystallization in their flask. They isolated this solid via vacuum filtration and fuily dried their product. Afterwards, they found they had recovered 0.256 grams of product, and determined the melting temperature of their product to be 108 - 112 °C. Calculate the % recovery for this students' procedure. Was their final product pure? How do you know?
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