Ein isoperiboles lösungskalorimeter zur messung von lösungsenthalpien der doppelchloride des magnesiums

For measuring solution enthalpies of the strong hygroscopic double chlorides, an isoperibol solution calorimeter was built. Samples of 2–5 g could be solved to a molar dilution 1 : 3000. The temperature difference between reaction vessel and thermostat was measured by a thermopile; the temperature of the thermostat was constant to 2 · 10^?4°C. From the molar enthalpies of solution (ΔH^L), enthalpies for the reactions nACl + MCl₂ = A_sMCl(_{s + 2}) were calculated: ΔHP^R = ? ΔH^L (double chloride) + ΔH^L(n Cl) + ΔH^L(MCL₂) These values are relatively small: about ? 50 kJ for the Cs-compounds, nearly zero for the K- and Na-compounds.