ammonium ions as acids

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In general, acids in acid-base reactions are neutral with H-A being a typical representation of an acid. When H-A loses a proton, it forms A- as the conjugate base. In some cases, however, the acid starts with a positive charge and loses a proton to form a neutral conjugate base. One example is an ammonium ion, NH4+. Another, perhaps more common, example is hydronium ion, H3O+. While positively charged acids are less common, they are still regularly encountered.