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I was doing an experiment on gold recovery. When I added some gold platted pins to battery acid nothing seemed to happen.I impatiently added some duluted hydrochloric acid labeled 20%, immediately there was a reaction that produced heat, bubbles and and a gas. I saw all aluminum dissolving giving the solution a gray colour and all gold platting disappearing away. It is now 2 days since I sat up the apparatus and the reaction is still going on but now very slow. I have tried to look through the glass for speckles of gold but all what I can see is gray dust settling at the base of the container and and silver particles in the solution. I would like to know if I dissolved the small gold and if so how can I recover it.

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  • $\begingroup$ Have you thought about how to dispose of the remains of this experiment, without creating a hazard for your health and for the environment? $\endgroup$ – Karl Oct 18 '18 at 19:50
  • $\begingroup$ To my recollection, different acids can oxidize gold but it is not soluble in water, so it stays at the surface of gold. You need some hydrochloric acid to form AuCl3, which is soluble, and this is why the reaction proceeds. There are many videos on YouTube about how to recover the gold $\endgroup$ – SteffX Feb 8 at 14:05

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