Assertion: formaldehyde | /r/AtLocation | aqueous solution
Facets:
Source sentences:
text: The formaldehyde used must be in aqueous solution at a weight concentration of 30 to 50%; and preferably one will use a 36% aqueous solution because of its wide availability.
text: Paraformaldehyde forms slowly when formaldehyde is in aqueous solutions and separates out as a white precipitate.