Mercury(II) Sulfide Precipitation (Vermilion)

HgCl₂ + Na₂S → HgS↓ + 2NaCl

Visão geral

Mercury(II) chloride reacts with sodium sulfide to form a black precipitate of mercury(II) sulfide (Ksp = 2 × 10⁻⁵²), the most insoluble compound commonly encountered. The black form (metacinnabar) slowly converts to the red form (cinnabar/vermilion) upon heating. HgS is so insoluble it is considered environmentally immobile.

Participantes

Papel	Substância	Coeficiente	Estado
Produto	Sodium Chloride NaCl	2	(aq)

Exemplo do cotidiano

Vermilion pigment, prized since antiquity for its brilliant red color in Chinese lacquerware and Renaissance paintings, is red mercury sulfide.

Importância industrial

O sulfeto de mercúrio, como cinábrio, é o principal minério de mercúrio. A imobilização do HgS é utilizada na estabilização de resíduos de mercúrio devido à sua insolubilidade extrema.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -83,0 kJ/mol

Reações relacionadas

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Lead Chloride Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Mercury(II) Sulfide Precipitation (Vermilion)?

The balanced equation is: HgCl₂ + Na₂S → HgS↓ + 2NaCl.

What type of reaction is Mercury(II) Sulfide Precipitation (Vermilion)?

Mercury(II) Sulfide Precipitation (Vermilion) is a precipitation reaction.

Is Mercury(II) Sulfide Precipitation (Vermilion) exothermic or endothermic?

Mercury(II) Sulfide Precipitation (Vermilion) is exothermic (releases energy). The enthalpy change (ΔH) is -83.0 kJ/mol.