Assertion: crude phosphoric acid | /r/CapableOf | carry impurity
Facets:
Source sentences:
text: This resulting crude acid is of 'intermediate strength and it carries impurities which must be removed.
text: Where phosphoric acid of a purity suitable for food purposes is to be derived from phosphate rock the crude phosphoric acid obtained by the acidulation of therock with sulphuric acid contains a number of impurities which must be removed or greatly reduced in volume.