One day Ria wents to jewellers house with his mother . His mother gaves an old jewellery to goldsmith to polish . next day when they brought the jewellery back , they found that was a slight less in its wieght ? why there was a loss in wieght?

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Solution

There was loss in weight of gold jewellery because goldsmith use aqua regia (a mixture HCl and HNO₃) to polish the surface of jewellery. This strong acidic mixture is able to dissolve outer layer of the noble metal gold. Thus we get the inner shiny layer of gold jewellery.

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One day Ria wents to jewellers house with his mother . His mother gaves an old jewellery to goldsmith to polish . next day when they brought the jewellery back , they found that was a slight less in its wieght ? why there was a loss in wieght?

There was loss in weight of gold jewellery because goldsmith use aqua regia (a mixture HCl and HNO3) to polish the surface of jewellery. This strong acidic mixture is able to dissolve outer layer of the noble metal gold. Thus we get the inner shiny layer of gold jewellery.

There was loss in weight of gold jewellery because goldsmith use aqua regia (a mixture HCl and HNO₃) to polish the surface of jewellery. This strong acidic mixture is able to dissolve outer layer of the noble metal gold. Thus we get the inner shiny layer of gold jewellery.