Acid: The Item

You can throw a flask of acid as a splash weapon. Treat this attack as a ranged touch attack with a range increment of 10 feet. A direct hit deals 1d6 points of acid damage. Every creature within 5 feet of the point where the acid hits takes 1 point of acid damage from the splash.

Spell Material Power Component/Focus
A common flask of acid has many uses as a power component, particularly with attack spells.
Acid Arrow (M): The spell’s acid lasts 1 round longer than normal.
Acid Fog (M): The fog’s radius and height increase by 5 feet.
Acid Splash (F): The spell deals +1 point of damage.
Acid Splash (M): The spell lasts 1 round longer than normal.
Dispel Magic (M): Using acid as a material component while attempting to dispel or counterspell a spell or effect with the earth subtype gives you a +2 bonus on your dispel check. This bonus applies whether you are using dispel magic, greater dispel magic, or some other spell that you can use for counterspelling (for example, if you have the Improved Counterspell feat).
Grease (M): The grease is acidic and deals 1 point of acid damage per round to any creature in the area or holding the greased object.
Wall of Ice (M): For each flask of acid used as a power component, you may designate one 10-foot square of ice wall that, if broken through, deals 1d6 acid damage in addition to the normal cold damage.

Source: Player's Handbook, Pathfinder- Adventurer's Armory

Acid: The Spell Descriptor

The following spells have the acid descriptor, meaning they deal corrosive damage to their targets. The list should not be considered comprehensive however.

Melf's Acid Arrow/Acid Arrow - Sor/Wiz 2

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