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Experiment : Purification of Benzoic Acid by recrystallization process . Explain the result that obtain.

Experiment : Purification of Benzoic Acid by recrystallization process . Explain the result that obtain.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Experiment : Purification of Benzoic Acid by recrystallization process .

Explain the result that obtain. 

A) Recrystalization of benzoic acid 1. Weigh a 5.00 g of impure benzoic acid sample into a 250 mL Erlenmeyer flask. 2. Observe and record the appearance (color, shape) of the sample. 3. Determine the melting point of the impure benzoic acid. 4. Add 75 mL of distilled water with small amount of activated carbon into the 250 mL Erlenmeyer flask. 5. Heat the Erlenmeyer flask on hot plate or Bunsen burner until the water boils. 6. Continue the heating process for another 2-3 minutes until the sample dissolves. In the meantime, boils a 20 mL of distilled water in a beaker and prepare the filter paper. 7. Filter the solution in the Erlenmeyer flask into an empty Erlenmeyer flask and rinse the filter paper with the boiled water in the beaker (Figure 2) 8. Set aside the flask to cool to room temperature slowly for crystallization. 9. After crystallization is complete at room temperature, cool the flask in an ice bath for a few minutes. 10. Isolate the resulting crystals by vacuum filtration on a Buchner funnel and wash with a small amount of chilled water (Figure 3). 11. Dry them on a sheet of filter paper before drying. 12. Describe the crystal of benzoic acid (color, shape). 13. Determine the melting point of the crystals.
Transcribed Image Text:A) Recrystalization of benzoic acid 1. Weigh a 5.00 g of impure benzoic acid sample into a 250 mL Erlenmeyer flask. 2. Observe and record the appearance (color, shape) of the sample. 3. Determine the melting point of the impure benzoic acid. 4. Add 75 mL of distilled water with small amount of activated carbon into the 250 mL Erlenmeyer flask. 5. Heat the Erlenmeyer flask on hot plate or Bunsen burner until the water boils. 6. Continue the heating process for another 2-3 minutes until the sample dissolves. In the meantime, boils a 20 mL of distilled water in a beaker and prepare the filter paper. 7. Filter the solution in the Erlenmeyer flask into an empty Erlenmeyer flask and rinse the filter paper with the boiled water in the beaker (Figure 2) 8. Set aside the flask to cool to room temperature slowly for crystallization. 9. After crystallization is complete at room temperature, cool the flask in an ice bath for a few minutes. 10. Isolate the resulting crystals by vacuum filtration on a Buchner funnel and wash with a small amount of chilled water (Figure 3). 11. Dry them on a sheet of filter paper before drying. 12. Describe the crystal of benzoic acid (color, shape). 13. Determine the melting point of the crystals.
Mass of impure benzoic acid (g) 5.00 g Аppearance: Color of impure benzoic acid Shape of impure benzoic acid Melting point range (°C) of impure benzoic acid Mass of recrystallized benzoic acid (g) Аppearance: Color of recrystallized benzoic acid Shape of recrystallized benzoic acid Melting point range (°C) of recrystallized benzoic acid White Powder 122 – 128°C 3.22 g White Crystalline solid 121 – 122°C
Transcribed Image Text:Mass of impure benzoic acid (g) 5.00 g Аppearance: Color of impure benzoic acid Shape of impure benzoic acid Melting point range (°C) of impure benzoic acid Mass of recrystallized benzoic acid (g) Аppearance: Color of recrystallized benzoic acid Shape of recrystallized benzoic acid Melting point range (°C) of recrystallized benzoic acid White Powder 122 – 128°C 3.22 g White Crystalline solid 121 – 122°C
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