C2H5NH3+ is the chemical formula for the ethylammonium ion, which is a positively charged ion formed from ethylamine. Ethylamine is an organic compound that contains an ethyl group (C2H5) attached to an amino group (NH2). When ethylamine gains a proton (H+), it becomes ethylammonium, resulting in the positive charge. This ion is commonly encountered in various chemical reactions and can act as a weak acid or a base. It is relevant in fields such as organic chemistry and biochemistry, where it may participate in the formation of ammonium salts or influence the behavior of amino acids.