15. A man went door to door posing as a goldsmith. He promised to bring back the
glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold
bangles to him which he dipped in a particular solution. The bange spared
like new but their weight was reduced drastically. The lady was upset but after a
futile argument the man beat a hasty retreat. Can you play the derethe to find
out the nature of the solution he had used?
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The man had used the solution of aqua-regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid. Aqua regia was so named because it can dissolve the noble metals gold and platinum. After dipping the gold ornaments in it the outer layer of gold gets dissolved and the inner shiny layer appears.
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