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I tried to refine gold, and I had something very strange happen. I have a bar of mixed metals made up of gold plated material. There is copper mixed in it for sure, and I would assume other metals too like steel, aluminum, and solder.

I put this bar in muriatic acid mixed with $\ce{H2O2}$, the reaction is over and by now it is just muriatic acid again, just more diluted.

Then I put the bar in a solution of baking soda mixed with water with acid still on it and an acid/base reaction happened. What I don't get is that within seconds the gold on the surface of the bar went into solution.

What happened, how the gold was dissolved, and how do I get it out of the solution?

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closed as unclear what you're asking by Ivan Neretin, Zhe, andselisk, Mithoron, NotEvans. Sep 4 '17 at 14:06

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ You put a gold-plated bar in a mixture of $\ce{HCl}$ and $\ce{H2O2}$ (what mixture and molarity?) to achieve what result? And then you put the bar, presumably still gold-plated(?), in an aqueous solution of $\ce{NaHCO3}$ and observed what reaction? And you determined the gold was dissolved how? $\endgroup$ – feetwet Sep 4 '17 at 21:59