what is aqua regia? What reaction take place that gold becomes clean and shiny?
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3Part Concentrate HCl +1 HNO3
Au + Aqua Regia = HAuCl4
When gold is dissolved in aqua regia, it forms chloroauric acid (HAuCl4). The chemical reaction shows gold reacting with both components of aqua regia: nitric acid (HNO3) and hydrochloric acid (HCl).
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Aqua regia is mixture of HCl and HNO3 in the ratio 3:1
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