Enthalpies of Formation of Crystal Hydrates Mn(CH3SO3)2⋅2H2O, Co(CH3SO3)2⋅4H2O, and Ni(CH3SO3)2⋅4H2O

Abstract

Crystalline hydrates Mn(CH₃SO₃)₂⋅2H₂O, Co(CH₃SO₃)₂⋅4H₂O, and Ni(CH₃SO₃)₂⋅4H₂O are synthesized and identified via X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, and thermogravimetry. Solution calorimetry is used to determine the enthalpies of dissolution in water at 298.15 K, and the standard enthalpies of formation of crystal hydrates of manganese, cobalt, and nickel methanesulfonates are calculated. The contribution from the enthalpy of the methanesulfonate ion to that of the formation of crystalline methanesulfonate in an additive scheme is estimated from the obtained data.