In the following reaction, HS-(aq) + H2O(l) ⇌ S2-(aq) + H3O+(aq)

HS- is an acid and H2O is its conjugate base.
H3O+ is an acid and HS- is its conjugate base.
HS- is an acid and S2- is its conjugate base.
H2O is an acid and S2- is its conjugate base.

1 answer

HS- is an acid and S2- is its conjugate base.