Why have most companies started to extract lithium from brine water rather than the mineral ore

The process is less expensive.

Explanation:

Lithium is an element valuable for the production of glass, aluminum products, and batteries. It is mined from ores of petalite (LiAl(Si2O5)2, lepidolite K(Li, Al)3(Al, Si, Rb)4O10(F, OH)2, spodumene LiAl(SiO3)2 and also subsurface brines. Australia and Chile are the world's largest producers of lithium.

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answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).