Assertion: hypophosphorous acid | /r/HasProperty | prepared in thepast
Facets:
value: by a. number of methods'such
type: OTHER
Source sentences:
text: Phosphorous acid has been-prepared in thepast by a. number of methods'such as: by the method of B.'G. Le Sage, involving the slow combustion of phosphorusby exposure to moist air (Mem.