Explain why we did not synthesize acetanilide by refluxing a mixture of aniline and

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If we directly refluxed the mixture of aniline and acetic anhydride, the acetylation could occur multiple times, resulting in a multi acetylated compound .

In order to prevent this problem, the aniline is first converted to a soluble salt. Now it can then be acetylated at manageable slow rates.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.