Physicochemical property:  | 
                                            Appearance and properties: Colorless, light yellow and transparent liquid.  
PH value: Acid medium. 
Melting point (℃): 1.25℃  
Relative density (water=1): 1.675 
Boiling point(℃): 104 
Solubility: Chlorine and phosphorus pentachloride 
Other properties: Gas is fuming, with irritating odor, strong hygroscopicity and corros 
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