Kelli Hi Kelli, Molten lava and sea water do react to make a mixture of hydrochloric acid and sea water called laze. This is a problem in Hawaii where lava has enetered the ocean for 10 years. The steam at the lava entry has a pH of 1.5 to 2.5.
Hydrochloric acid is toxic and causes irritation to the throat, lungs, eyes, and nose.
That's why the park keeps visitors away for the acidic steam plume.