Q1. How Can Mercury Chloride and Mercury (II) Chloride be Prepared?
Ans. Generally, by the action of the chlorine on mercury (I) chloride or mercury, mercury chloride is obtained. Another method includes the addition of HCl (Hydrochloric acid) to a solution that is dry, concentrated mercury (I) compound such as nitrate. But the best method is to obtain via the action of chlorine on mercury.
Mercury (II) Chloride is obtained by the addition of HCl to a concentrated and hot solution of nitrate:
HgNO₃ + 2HCl → HgCl₂ + H₂O + NO₂
A mixture of mercury sulphate (HgSO₄) and sodium chloride (HCl) is heated to give volatile Mercury (II) Chloride, which results in the formation of small rhombic crystals. With the increase in the temperature, the solubility of the compound also increases.