Assertion: salt's potassium | /r/ObjectUse | used as the reductant
Facets:
value: by the rieke method
type: OTHER
value: from their salts
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: Because it can reduce the salts to the metal, potassium is often used as the reductant in the preparation of finely divided metals from their salts by the Rieke method.