Aqua Regia will dissolve gold. Aqua Regia is a mixture of Nitric acid and Hydrochloric acid.
"insoluble"
salt
Yes.
no
NAOH
Better in Water(H2O)
No because of the acidic acid
Because ethanol is not a polar solvent.
oxidation dissovle acid
solibility
Any non-polar substance will not dissolve in water (insoluble).
Barium chloride or BaCl2