Player's Handbook, Wizards of the Coast, p. 148, 150

Acid (vial)

Adventuring Gear Common

As an action, you can splash the contents of this vial onto a creature within 5 feet of you or throw the vial up to 20 feet, shattering it on impact. In either case, make a ranged attack against a creature or object, treating the acid as an improvised weapon. On a hit, the target takes 2d6 acid damage.

Cost: 25 GP Weight: 1 lb. / 0.5 kg