Question

Can phase transition be used to test the purity of gold?

Answer 1

Yes, the phase transition is used to test the purity of gold($\mathrm{Au}$).

• Gold has a sharp melting point.
• The sharp melting point means the short range of temperature at which a substance melts.
• If there will be any type of impurity in gold, it will not show a sharp meeting point.
• The range of temperature at which gold melts increases because of the addition of impurity.
• Hence, the purity of gold can be checked by phase transition.