A pH Scale for the Protic Ionic Liquid Ethylammonium Nitrate

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  • Ryo Kanzaki
    Graduate School of Science and Engineering Kagoshima University 1-21-35, Korimoto Kagoshima 890-0065 Japan
  • Hitoshi Kodamatani
    Graduate School of Science and Engineering Kagoshima University 1-21-35, Korimoto Kagoshima 890-0065 Japan
  • Takashi Tomiyasu
    Graduate School of Science and Engineering Kagoshima University 1-21-35, Korimoto Kagoshima 890-0065 Japan
  • Hikari Watanabe
    Graduate School of Science and Technology Niigata University 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan
  • Yasuhiro Umebayashi
    Graduate School of Science and Technology Niigata University 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan

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<jats:title>Abstract</jats:title><jats:p>To quantify the properties of protic ionic liquids (PILs) as acid–base reaction media, potentiometric titrations were carried out in a neat PIL, ethylammonium nitrate (EAN). A linear relationship was found between the 14 p<jats:italic>K</jats:italic><jats:sub>a</jats:sub> values of 12 compounds in EAN and in water. In other words, the p<jats:italic>K</jats:italic><jats:sub>a</jats:sub> value in EAN was found to be roughly one unit greater than that in water regardless of the charge and hydrophobicity of the compounds. It is possible that this could be explained by the stronger acidity of HNO<jats:sub>3</jats:sub> in EAN than that of H<jats:sub>3</jats:sub>O<jats:sup>+</jats:sup> in water and not by the difference in the solvation state of the ions. The pH value in EAN ranges from −1 to 9 on the pH scale based on the pH value in water.</jats:p>

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