Ermittlung der Solvolysenkonstante von Nitrosylchlorid in Methanol

The equilibrium constantK of the methanolysis of nitrosyl chloride was determined. The activities of HCl and CH₃OH in methanolic solutions of hydrogen chloride have been already published. The equilibrium was established from the right side by adding known amounts of methyl nitrite to methanolic hydrochloric acid (0–18m). The equilibrium concentration of NOCl was measured by means of aPulfrich photometer. For 25°C it was foundK=14.1, for 15°CK=18.9, and for 0.5°CK=30.3. From these results the thermodynamic functions of the methanolysis of nitrosyl chloride ΔG°, ΔH° and ΔS° were calculated.