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A Merman is attacking.
The sodium being taken in by his gills with the sea water becomes Lye.
----one cubic foot---- in, through, around, out, and as much as it takes to become a cubic foot of LYE.
If one argues you must target the seaWATER ....Salt content:
'A cubic foot of seawater contains about 2.2 pounds of salt' according to San Diego State University."
If it is water that is targeted it becomes ten cubic feet and then 22 POUNDS of salt---
Definitely going to be some fort and concentration checks...acid damage as well?
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First, the character needs to have an appropriate craft skill to make an item with Fabricate. Since Electrolyzing water is a modern technique, the character will not have the relevant craft skill.
Second quality of the finished item depends on the quality of the base material. Ocean water is probably considered very low quality for making lye. Before electrolyzing sea water, it is filtered and treated. Typically, you also add electrolytes and potassium hydroxide. This will mean the quality of the lye created is extremely poor.
Finally, the casting time of the fabricate is measured in full rounds. That will give the merman a time to move out of the area you are creating the lye in. Since you are underwater, the lye will also end up being diluted. Given the slow creation time and poor quality of the lye it probably will not do that much.
Salt (Sodium) is considered a mineral so the target is reduced to 1 cubic foot per level.
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Who is to say that the laws of physics in a world where magic works is the same as our world. As Oil Ironbar brought up Alchemy in the Pathfinder universe actually works. If medieval alchemy actually works that would seem to indicate that the natural laws of the universes diverge at some point. That being the case electrolysis may not work.
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This is the same logic I can use kill everyone in a room by making NOx from the atmosphere. Or you can use the spell as intended instead of trying to cheese it into a deathspell, really up to you and your GM.
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[quoite]abricate
Source PRPG Core Rulebook pg. 280
School transmutation; Level arcanist 5, occultist 5, psychic 5, sorcerer 5, wizard 5
Casting
Casting Time see text
Components V, S, M (the original material, which costs the same amount as the raw materials required to craft the item to be created)
Effect
Range close (25 ft. + 5 ft./2 levels)
Target up to 10 cu. ft./level; see text
Duration instantaneous
Saving Throw none; Spell Resistance no
Description
You convert material of one sort into a product that is of the same material. Creatures or magic items cannot be created or transmuted by the fabricate spell. The quality of items made by this spell is commensurate with the quality of material used as the basis for the new fabrication. If you work with a mineral, the target is reduced to 1 cubic foot per level instead of 10 cubic feet.
You must make an appropriate Craft check to fabricate articles requiring a high degree of craftsmanship.
Casting requires 1 round per 10 cubic feet of material to be affected by the spell.
You aren't converting the salt and water in the seawater to lye, you are converting seawater into a product made of seawater.
Fabricate doesn't produce chemical reactions; it changes shape to things.
Can Fabricate turn X gp worth of powdered gems (e.g. ruby, diamond) into a gem worth X gp? What about vice versa?
Turning normal gems into powered gens should not be a problem, but the powdered gems may be worth less than the original material. Part of the value of a gem is in the way it is cut and polished to create the final product. So, turning a finished gem into a powder will reduce its value. If you used raw unworked gems instead of finished gems it should work.
Turning powered gems into finished gems will not work. Gems are not made of powered gems. That would be like turning ash into a wooden object. Basically, what the spell does is to allow you to do is to speed up the crafting process.
When you use sawdust to create particle board it does not have the characteristics of real wood. An object made of particle board is not the same as one made out of actual oak, even if the sawdust was originally oak.
Likewise, the material made by sintering gems is not the same as an actual gem.