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why do you add saturated sodium bicarbonate to your crude aspirin? why do you later add...

why do you add saturated sodium bicarbonate to your crude aspirin? why do you later add 3M HCL?

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Answer #1

Aspirin is insoluble in water . However on addition Sodium bicarbonate reacts vigorously producing carbon dioxide gas, which also produces enough agitation to allow the active ingredients to dissolve.

The main purpose of the sodium bicarbonate is to deprotonate the carboxylic acid in acetylsalicylic acid to produce a sodium acetylsalicylate salt which is much more soluble in water (due to the presence of a charged carboxylate group). The reaction between NaHCO3 and acetylsalicylic acid yields H2CO3 (hence, H2O + CO2).

Later on the sodium salt is again convertetd to acid form by HCL.

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