Ascorbic acid

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Ascorbic acid, commonly known as Vitamin C (CAS number: 50-81-7) is one of several chemicals that can be used to precipitate gold from gold chloride solutions.

Ascorbic acid isn't very selective when it comes to what it precipitate from solution. It can quantitatively precipitate gold, palladium, silver and copper from solutions, both chloride and nitrate solutions. At least when the solution is boiled.

Some properties :

  • The precipitate is a lot finer than several other methods gives.
  • The selectivity is low, if the liquid contains palladium, silver or copper some of it will be reduced to metal too. Especially if the solution is close to boiling.
  • By cooling a gold chloride solution the co-precipitation of other metals is kept to a minimum.
  • Does not emit any noxious gases as sulfur dioxide.
  • Does not create any false positives when testing with stannous chloride.
  • It will precipitate silver from a silver nitrate solution as a fine powder.
  • It will precipitate palladium from a palladium nitrate solution.

Contents

Sources

There are several places where ascorbic acid can be bought. For example via ebay or amazon.

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