Noun
An oxide containing three atoms of oxygen; as, sulphur trioxide, SO3; -- formerly called tritoxide.
Source: Webster's dictionaryDry separation is the method most commonly used to produce a chemically useful form of astatine. citation citation Wet The bismuth (or sometimes bismuth trioxide ) target is dissolved in, for example, concentrated nitric or perchloric acid. Source: Internet
For example, sulfur trioxide is not produced quantitatively by the combustion of sulfur. Source: Internet
By contrast, selenates and selenites have an oxidant mode of action similar to that of arsenic trioxide and are very toxic. Source: Internet
This combustion process produces gaseous sulfur dioxide ( SOmain ) and sulfur trioxide ( SOmain ) which are then used to manufacture "new" sulfuric acid. Source: Internet
Diethyl sulfate and triethyl phosphate are prepared by treating ethanol with sulfur trioxide and phosphorus pentoxide respectively. Source: Internet
Heating this solid gives molybdenum trioxide: Roger F. Sebenik et al. Source: Internet