Question

Write the method to obtain mercury from cinnabar and write the chemical equation

Answer 1

Hey frnd....

Cinnabar (HgS) is the only important ore of Hg. It is concentrated by froth floatation method

mercury is extracted from this ore by heating it in air at

773-873K

HgS + O2 -------> Hg + SO2

The mercury vapors thus obtained are condensed to give liquid metal. Hg thus obtained contains impurities of Zn, Sn and Pb. These are removed by treating the impure metal with dil HNO3, mercurous nitrate, Hg2(NO3 )2 thus formed react with metals present as impurities forming their nitrates which pass into solution leaving behind pure mercury. However, it is best purified by distillation under reduced pressure.

6Hg + 8HNO3 (dil. ) ------> 3 Hg ( NO3 )2 + 4H2O + 2NO

Zn + Hg2 ( NO3 )2 ------> Zn ( NO3 )2 + 2Hg

now you get pure Mercury (Hg)

HOPE THIS HELP YOU ☺☺