Assertion: hydrocyanic acid | /r/MadeOf | some hydrogen sulfide
Facets:
Source sentences:
text: The present method depends on the fact that zinc cyanide is insoluble in water and by treating a dilute solution of hydrocyanic acid containing some hydrogen sulfide with a soluble zinc salt under proper conditions, all of the hydrocyanic acid may be precipitated and by subsequent treatment of this precipitate with an acid, the hydrocyanic acid and residual traces of hydrogen sulfide are set free and may be separated by fractional rectification in a suitable apparatus.