With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Aqueous
solutions
are
mildly
alkaline
due
to
the
formation
of
carbonic
acid
and
hydroxide
ion
:
Aqueous:other-chemicalthing
solutions:other-chemicalthing
are:O
mildly:O
alkaline:O
due:O
to:O
the:O
formation:O
of:O
carbonic:other-chemicalthing
acid:other-chemicalthing
and:O
hydroxide:other-chemicalthing
ion:other-chemicalthing
::O