Assertion: concentrated nitric acid | /r/CapableOf | serve to passivate metal
Facets:
value: towards further reactions
type: PURPOSE
Source sentences:
text: Metals like chromium, iron and aluminium readily dissolve in dilute nitric acid, but the concentrated acid forms a metal-oxide layer that protects the bulk of the metal from further oxidation; thus, concentrated nitric acid serves to passivate these metals towards further reactions.