A man went door to door posing 2s 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 bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man had a hasty retreat. Canyou play the detective to find out the nature of the solution he had used ?

Explanation

The solution he had used is Aqua regia. It is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio 3:1. Aqua regia has the ability to dissolve the metals like gold and platinum. Since the outer layer of the gold bangles gets dissolved in aqua regia so their weight was reduced drastically.