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How to obtain yellow gold precipitate

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Dear Sir,

I would like to ask you a question about yellow gold powder. I wanted to know how to obtain yellowish precipitate of gold from cyanide or gold chloride solution. I have tried with some solutions but the gold is always brown in color.

Hope you would be able to reply back to me.


Yours Sincerely,

Raj Mani
- Kathmandu, Nepal

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Hi,
If it is gold chloride, add conc. sulphuric acid and boil , god reduces, or pass sulphurdioxide gas into it , or add sodium metabisulphite to reduce the gold in yellow form.or you can also add sodium boro hydride , but reaction is very vigorous.If gold is in Potassium cyanide form , slowely add sulphuric acid into it under fume hood, and heat it, we can reduce gold out of it, see that you perform this GPC reaction in fume chamber to expel HCN gases liberated from it.

Hope this will help .

Panjala Mukesh      fashion jewelry mfgr. Hyderabad, India

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July 17, 2008

hello. Since chlorine is produced through electrolysis, is it possible to separate chlorine from gold chloride solution leaving gold in solid state behind?

balasarravanan palanirajh
plating shop apprentice - colombo, sri lanka