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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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Why is methanol chosen as the solvent for recrystallization? (Check all that apply.) Because the product and the impurities dissolve well at the boiling point of the solvent. Because it can easily be boiled off. Because the reactants dissolves less than the product in methanol at low temperatures. Because the product dissolves less than the reactants in methanol at low temperatures. Because it has a low boiling point
Transcribed Image Text:Why is methanol chosen as the solvent for recrystallization? (Check all that apply.) Because the product and the impurities dissolve well at the boiling point of the solvent. Because it can easily be boiled off. Because the reactants dissolves less than the product in methanol at low temperatures. Because the product dissolves less than the reactants in methanol at low temperatures. Because it has a low boiling point
Why are ice and water added to the reaction mixture after the reaction was completed? (Check all that apply.) To protonate the intermediate to form the product To increase the volume of the solution. To cause the organic compounds to precipitate. To dilute the solution before filtration to avoid that the filter paper to dissolve To deprotonate the intermediate to form the product
Transcribed Image Text:Why are ice and water added to the reaction mixture after the reaction was completed? (Check all that apply.) To protonate the intermediate to form the product To increase the volume of the solution. To cause the organic compounds to precipitate. To dilute the solution before filtration to avoid that the filter paper to dissolve To deprotonate the intermediate to form the product
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Chemistry homework question answer, step 1, image 1

Answer:

  • Methanol is a low boiling solvent. Polar impurities soluble readily.
  • Because of product soluble less than reactant (impurity). we remove impurities easily.  
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