## Question

###### 5. In the synthesis of aspirin, what is the purpose of ;a) The sulfuric acid?b) The hot water bath?c) The ice bath?d) Adding distilled water in the reaction flask, before puttingthe flask in an ice bath?Q2 ). After the aspirin has been filtered;a) Why is it washed with distilled water?b) Why is ice cold distilled water used, instead of roomtemperature water, to wash the aspirin?c) Why is the vacuum hose disconnected when washing the aspirinwith distilled water?

5. In the synthesis of aspirin, what is the purpose of ; a) The sulfuric acid? b) The hot water bath? c) The ice bath? d) Adding distilled water in the reaction flask, before putting the flask in an ice bath? Q2 ). After the aspirin has been filtered; a) Why is it washed with distilled water? b) Why is ice cold distilled water used, instead of room temperature water, to wash the aspirin? c) Why is the vacuum hose disconnected when washing the aspirin with distilled water?

Chemistry 101

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## FAQs

### What is the purpose of synthesis of aspirin? ›

In 1897, Felix Hoffmann discovered that there was indeed a way to make this drug **less irritating to the throat and stomach**: by reacting Salicylic acid with Acetic Anhydride, it would be possible to acetylate the Salicylic acid to remove one of these proton-donating groups and thus make it less irritating to the body.

**What is the purpose of salicylic acid in the synthesis of aspirin? ›**

To prepare aspirin, salicylic acid is reacted with an excess of acetic anhydride. A small amount of a strong acid is used **as a catalyst which speeds up the reaction**.

**What is the main reaction in the synthesis of aspirin? ›**

The synthesis of aspirin is known in organic chemistry as an **esterification reaction**. This is a substitution reaction in which an alcohol (the –OH group in salicylic acid) reacts with acetic anhydride to form an ester, aspirin.

**What is the purpose of sulfuric acid in the synthesis of aspirin? ›**

Making aspirin

In this case just a few drops of sulphuric acid added to the mixture means that there are some free positive hydrogen ions in the solution which can bind to the ethanoic anhydride. This **makes it more active and speeds up the reaction**.

**What is the purpose of recrystallization of aspirin? ›**

Any remaining contaminants are removed by recrystallization in a solvent in which aspirin is sparingly soluble. **Aspirin separates then as crystals leaving impurities behind in solution**. This process should give a relatively clean product, whose purity can be determined by melting point analysis.