Assertion: nitrous acid | /r/HasProperty | formed in situ
Facets:
value: usually
type: TEMPORAL
value: for most purposes
type: PURPOSE
Source sentences:
text: For most purposes, nitrous acid is usually formed in situ by the action of mineral acid on sodium nitrite: It is mainly blue in colour
text: For most purposes, nitrous acid is usually formed in situ by the action of mineral acid on sodium nitrite: It is mainly blue in colour