How do you tell just by looking at a chemical equation if it will react or not? For example, LiI(aq) + BaS(aq) don't react, but I don't know how to tell that just by looking at the equation. Any clear explanation is welcomed. It's not for a HW answer, just for my knowledge base. I feel silly for even having to post this.
Stacey Warren - Expert brainly.com
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There's a subtlety when an equation like that it's written, the aqueous symbol implies that the ions are dissolved/solvated, meaning that they're each surrounded by a clathrate ("casing") of water molecules.
If the species dont interact with one another and remain soluble or chemically unchanged, then no reaction took place and they remain solvated.
It's not always obvious to know if a reaction will occur because there are so many different reactions, but for now, identifying possible insoluble products (with a solubility table) will be a good start.