Question 2 Match each step in the prepareation of acetylsalicylic acid with the

Question

Question 2 Match each step in the prepareation of acetylsalicylic acid with the reason for performing that step Question Use a DRY 5 mL conical vial for the reaction Selected Match A. so that product can collect on top of crystal paper, rather than passing through the paper in the solution Add one drop of concentrated phosphoric acid to the reaction mixture B. Serves as a catalyst for the reaction Heat the water bath to 50 deg C Add an air condensor to the conical vial C. So that waterl fully evaporate giving a purer product moisten filter paper with a few drops of water prior to filtration making sure crystals are formed before trying to filter waiting overnight to take the final melting point of the product All Answer Choices A so that product can collect on top of crystal paper, rather than passing through the paper in the solution B, Serves as a catalyst for the reaction C. So that water will fully evaporate giving a purer product D. To avoid reaction of acetic anhydride with water E. to avoid crystals passing underneath the paper and through the filter F. To avoid splashing and evaporation of solvents while heating G. To speed up the desired reaction, while avoiding a second reaction with a higher activation energy [None Given] [None Given] [None Given]

Explanation / Answer

Use dry 5mL conical vial - D) to avoid reaction of acetic anhydride with water

Add concentrated H3PO4 to reaction mixture - B) serves as catalyst for reaction

Heat water bath to 50°C - G) to speed up the desired reaction while avoiding a second reaction with higher activation energy.

Add air condensor to conical vial - F) to avoid splashing and evaporation of solvents while heating.

Moisten filter paper with few drops of water prior to filtration - E) to avoid crystals passing underneath the paper and through the filter

Making sure crystals are formed before trying to filter - A) so product can collect on top of crystal paper rather than passing through the paper in solution.

Wait overnight to take final melting point of the product- c) so that water will fully evaporate giving a purer product.

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