DATA Note: Use the videos as references except when data is provided here. Table 1. Selection of Recrystallizing Solvent. Solvents Dissolution at room temperature? (+ or −) Dissolution at elevated temperature? (+ or −) Distilled water - - Acetone + n/a 95% ethanol - + Toluene + n/a Solid sample: Naphthalene Table 2. Mass Measurements. Mass, g Sample solid 0.5021 Empty watch glass 35.7602 Watch glass with recrystallized sample 36.2485 Table 3. Melting Point Determination. Temperature, oC Appearance of Sample in Capillary Tube … Solid 78.4 Solid 79.3 Solid with signs of liquid 79.9 Solid, liquid 80.6 Liquid, solid 81.3 Liquid with signs of solid … Liquid Theoretical Melting Point, oC: 80.2°C (176.4°F) QUESTIONS Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good recrystallizing solvent. What does it mean for a solution to become supersaturated? Why should the washing solvent be cold in the suction filtration step? Based on Table 2, what is the percent recovery of the data in this experiment? Show a complete solution. Based on Table 3, report the melting point range (in °C) of the sample. Has recrystallization successfully purified the sample? Why?

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter7: Extraction

Section: Chapter Questions

Problem 1Q

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DATA

Note: Use the videos as references except when data is provided here.

Table 1. Selection of Recrystallizing Solvent.

Solvents	Dissolution at room temperature? (+ or −)	Dissolution at elevated temperature? (+ or −)
Distilled water	-	-
Acetone	+	n/a
95% ethanol	-	+
Toluene	+	n/a

Solid sample: Naphthalene

Table 2. Mass Measurements.

	Mass, g
Sample solid	0.5021
Empty watch glass	35.7602
Watch glass with recrystallized sample	36.2485

Table 3. Melting Point Determination.

Temperature, ^oC	Appearance of Sample in Capillary Tube
…	Solid
78.4	Solid
79.3	Solid with signs of liquid
79.9	Solid, liquid
80.6	Liquid, solid
81.3	Liquid with signs of solid
…	Liquid

Theoretical Melting Point, ^oC: 80.2°C (176.4°F)

QUESTIONS

Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good recrystallizing solvent.
What does it mean for a solution to become supersaturated?
Why should the washing solvent be cold in the suction filtration step?
Based on Table 2, what is the percent recovery of the data in this experiment? Show a complete solution.
Based on Table 3, report the melting point range (in °C) of the sample.
Has recrystallization successfully purified the sample? Why?

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