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 bangles sparkled 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 detective to find out the nature of the solution he had used?
Answers
He used the solution of the Aqu regia and it is Latin words that mean the Royal Water and it is mixture of the concentrated Hydrochloric acid and well concentrated nitric acid in the part of the ratio of 3:1.
It has ability of the dissolving the metal such as the platinum, gold.
Therefore the outer layer of the gold bangles get dissolved in the part of the aqua regia so their weight was reduce into the drastically with no trouble and risk of it.
Answer:
BTS
He must have dipped the gold metal in the solution of aqua regia − a 3:1 mixture of conc. HCl and conc. HNO3. Aqua regia is a fuming, highly corrosive liquid. It dissolves gold in it. After dipping the gold ornaments in aqua regia, the outer layer of gold gets dissolved and the inner shiny layer appears. That is why the weight of gold ornament reduced.