Collect. Czech. Chem. Commun.
1983, 48, 1532-1537
https://doi.org/10.1135/cccc19831532
Differential heats of dissolution of potassium nitrate in water at 298.15 K near the saturation concentration
Stanislav Kolaříka, Vladimír Pekárekb and Jiří Hostomskýb
a Chemopetrol, Research Institute of Inorganic Chemistry, 400 60 Ústí nad Labem
b Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6
Abstract
Differential heats of dissolution of potassium nitrate in water at 298.15 K were measured on an 8 700 LKB calorimeter over a molality range 3-3.5 mol/kg. The dependence of the differential heat of dissolution, ΔLm (kJ/mol), on the molality can be described over the above range by the relation ΔLm = -33.933 + 3.635m. The value of the endothermic last dissolution heat obtained by extrapolation to the saturation concentration of 3.75 mol/kg was found to be -20.303 kJ/mol, with a standard deviation of 0.37 kJ/mol.
