How do I get gold back from aqua regia?

The nitric acid from the excess of aqua-regia used in the digestion is removed either by boiling or chemical reaction. To recover the gold as metal a reducing chemical is added to selectively change the gold chloride into solid gold particles and leave the other metal chlorides unchanged and in solution.

Can gold be dissolved?

The most useful and important vehicle for dissolving gold is aqua regia, (royal water), composed of two parts of hydrochloric (muriatic) acid, and one part of nitric (aquafortis). The per-chloride of gold dissolves in alcohol and ether, in which condition it is employed as a gold wash for steel instruments.

Which solution can dissolve gold?

Aqua regia
Aqua regia is a mixture of nitric and hydrochloric acids. It takes its name from its ability to dissolve gold, which is sometimes referred to as the royal metal.

How to check gold in aqua regia?

Gold testing is the main part of aqua regia process. Now, the question is this, How to check gold in solution. You can use stannous chloride for the gold test. Simply take a pinch of stannous chloride and dissolve in water. Take a drop of gold solution on filter paper piece and use stannous chloride solution on it.

How do you prepare acid to dissolve gold?

Place your gold or finely powdered ore in a Pyrex container breaker. Mix 1 part nitric acid to 3 parts hydrochloric acid in a separate glass or plastic container. When mixing the acids together, use great caution! Add the acid mixture, very slowly, to the Pyrex container or beaker containing the ore.

How do you test for the presence of gold in solution?

Take a drop of gold solution on filter paper piece and use stannous chloride solution on it. If the color drop becomes black or dark brown then it means gold is in solution. If nothing happens then no gold in solution. Many people use a cotton bud for this test but I don’t like this.

What should you not do with aqua regia?

Aqua regia, nitric acid and hydrochloric acid CAN KILL IF SWALLOWED. Always wear rubber gloves, plastic safety glasses and a plastic or rubber apron. Aqua regia can ruin your clothes and shoes. Furnace or oven for firing. It must heat to 1950 degrees F for the gold and 2100 degrees F for silver.