Solution enthalpy of ionic liquids [C<sub><italic>n</italic></sub>Py][HSO<sub>4</sub>](<italic>n</italic>=2, 3, 4, 5, 6)

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<p indent="0mm">Ionic liquids are known as environmentally friendly solvents in the 21st century, and they have become one kind of the most attractive soft materials in industry and academic communities. The thermodynamic data of ionic liquid are important parameters in the industry. It is crucial to obtain thermodynamic data for the application of the ILs in the industry and technological design. However, it has become a big obstacle to the industrialization of ionic liquids due to the lack of foundation data. In this article, five acidic pyridine-based ionic liquids [C_{<italic>n</italic>}Py][HSO₄](<italic>n</italic>=2, 3, 4, 5, 6) were synthesized by using the neutralization method and characterized by ¹H NMR spectrum. The molar solution enthalpies were measured by using a SRC100 type calorimeter, which the calorimeter was verified by standard material KCl, solution enthalpies at different molalities of five kinds of ILs [C_{<italic>n</italic>}Py][HSO₄](<italic>n</italic>=2, 3, 4, 5, 6) were also determined, and the molar solution enthalpies at the infinite dilution and relative parameters were also obtained by application of Pitzer’s equation.