H3O+ explanation

[Jaden Haskins 2E]

If H+(aq) is "code" for H3O+, then would you need to write H3O+(aq) because that coordination compound is also in water? or would you omit the state of matter because it is technically including it in the compound?

[Gabby Magat 3F]

I think you still put (aq) despite H3O+ arising from the reaction between H2O and H+ since you do so for the rest of the reactants/products (correct me if my reasoning is wrong!). But the (aq) in front of H3O+ does hint that there is water in the compound.

[Jiwon_Chae_3L]

I think you should still include the aqueous notation as H3O+ if for no other reason than clarity.

[Nathan Lao 2I]

I'm pretty sure you would still write the (aq). The reaction is still occurring in water, so the H3O+ would be denoted as aqueous.
When in doubt, I don't think writing a state of matter in reaction equations will do any harm (unless its incorrectly identified).

[Kaiya_PT_1H]

I think the other people are right, better to be safe than sorry and include (aq)!