Goldsmith dipped the set
of the gold bangles in aqua regia solution. Aqua regia is a freshly prepared
mixture of 1 part of cone. HNO3 and 3 parts of cone. HCl by volume.
Aqua regia dissolved a considerable amount of gold from the dipped gold bangles
and hence reduced their weight drastically. The goldsmith (dishonest) can
recover the dissolved gold from aqua regia by a suitable treatment.
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