Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  N'ụzọ: A na-ekewapụta njikọ nke aspirin dị ka mmeghachi omume esterification. A na-eji acetic anhydride, acid derivative, na-emeso salicylic acid, na-ebute mmeghachi omume kemịkal nke na-eme ka hydroxyl nke salicylic acid ghọọ otu ester (R-OH → R-OCOCH3). Usoro a na-emepụta ọgwụ aspirin na acetic acid, bụ́ nke a na-ewere dị ka ihe na-esi na ya apụta. A na-ejikarị obere sulfuric acid (na mgbe ụfọdụ phosphoric acid) eme ihe dị ka ihe mkpali. A na-ejikarị usoro a eme ihe na ụlọ akwụkwọ gụsịrị akwụkwọ.  Ajụjụ: Gịnị ka a na-eji sulfuric acid eme?
ihe na-akpali akpali