The goal of this experiment is to synthesize dibenzylacetone from acetone and be
ID: 554124 • Letter: T
Question
The goal of this experiment is to synthesize dibenzylacetone from acetone and benzaldehyde. Part of this experiment involves recrystallization and the lab handout explains this technique. 1. Consider the solvent used for recrystallization. A. The compound should be soluble in the solvent attemperature and not very soluble at temperature. B. The impurity should be insoluble or soluble at temperatures. C. Solubility is the maximum concentration usually possible for a solute in a particular solvent at a given temperature. At the same temperature you dissolve all the solute you can in 5.0mL of solvent and also 10mL of solvent to make saturated solutions. Which of the following statements is true? Equal mass of solute dissolves in each volume The concentration in each solution is the same The concentration in the 10mL solution is greater The mass of solute is greater in the 10mL, solution True True True True False False False False D. Complete the sentence: Recrystallizations should be conducted using (minimal/maximum) solvent to dissolve the solute at or near the 3. How are soluble impurities removed during recrystallization?Explanation / Answer
1.
A) The compound should be soluble in the solvent at boiling temperature and very soluble at room temperature.
B) The impurity should be insoluble or soluble at room temperature.
C) i) Equal mass of solute dissolves in each volume- False
ii) The concentration in each solution is the same-True
iii) The concentration in the 10 mL solution is greater- False
iv) The mass of solute is greater in the 10 mL solution- True
D) Recrystallization should be conducted using minimal solvent to dissolve the solute at or near the boiling temperature.
3.
At boiling temperature, solute is dissolved along with impurities. During crystallization, solute is crystallized and impurities remain dissolved in solvent. After filtration, soluble impurities are separated from the solute.
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