Dictionary,Defintion,Meaning,What is Mercury,Mercury II Sulphide,Mercurous chloride,Mercurous chromate,Mercurous iodide

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Home >> Inorganic Chemistry Dictionary >> Mercury Mercury II Sulphide

Your Ad Here	Mercurous chloride Hg₂Cl₂, odourless, nonpoisonous white crystals that darken in light; insoluble in water, alcohol, and ether; melts at 302°C; used in medicine and pyrotechnics. Also known as mercury monochloride; mercury protochloride; mild mercury chloride. Mercurous chromate Hg₂CrO₄, red powder with variable composition; decomposes when heated; soluble in nitric acid, insoluble in water and alcohol; used to colour ceramics green. Also known as mercury chromate.
Mercurous iodide Hg₂I₂ odourless, tasteless, poisonous yellow powder; darkens when heated; insoluble in water, alcohol, and ether, sublimes at 140°C; used as external medicine. Also known as mercury protoiodide. Mercurous oxide Hg₂O, a poisonous black powder; insoluble in water, soluble in acids; decomposes at 100°C.
Mercurous phosphate Hg₃PO₄, light sensitive white powder with variable composition; insoluble in alcohol and water, soluble in nitric acid; used in medicine. Also known as mercury phosphate; neutral, normal, or tertiary Mercurous phosphate; trimercurous orthophosphate. Mercurous sulphate Hg₂SO₄, poisonous yellow to white powder, soluble in hot sulfuric acid or dilute nitric acid, insoluble in water; used as a catalyst and in laboratory batteries. Mercury symbol Hg, refers to a heavy silver liquid metallic element which belong to the zinc group; a.n. 80; r.a.m. 200.59; r.d. 13.55; m.p. 38.87°C; b.p. 356 58°C. The main ore is the sulphide cinnabar (HgS), which can be decomposed to the elements.	Your Ad Here
Mercury (I) chloride (Mercurous chloride, calomel, Hg2Cl₂) refers to a white precipitate prepared by adding dilute hydrochloric acid to a mercury (I) salt solution or by subliming mercury (II) chloride with mercury. Mercury (I) chloride is sparingly soluble in water and is blackened by both ammonia gas, which it absorbs, and by alkalis. It is used a s a purgative.
Your Ad Here	Mercury (I) oxide (Mercurous oxide, Hg₂O), there is some doubt as to the existence of this compound. The black precipitate formed on addition of sodium hydroxide solution to a solution of mercury (I) nitrate is thought by some to be mercury (I) oxide; others, who doubt its existence, think that the blackness of the precipitate is due to some free mercury. X ray examination of this black compound has shown it to be an intimate mixture of mercury (II) oxide and mercury. Mercury (I) sulphide (Mercurous sulphide, Hg₂S), (There is some doubt as to the existence of this compound). The brownish black precipitate formed when mercury has been treated with cold concentrated sulphuric acid form a long time is thought to be mercury (I) sulphide.

Alternatively it may be obtained by the action of hydrogen sulphide or an alkaline sulphide on a mercury (I) salt solution. As soon as the mercury (I) sulphide gets formed it disproportionates to yield mercury (II) sulphide and mercury.

Mercury II sulphide
refers to a red or black compound, HgS, occurring naturally as the minerals cinnabar (red) and metacinabar (black). It can be prepared as a black precipitate by bubbling hydrogen sulphide through a solution of mercury (II) nitrate. The red form is prepared by sublimation. The compound is also called vermilion (used as a pigment).

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Part 3 Mercury - Mercury II Sulphide Metal Carbonyls - Metallography Mischmetal - Molybdenum Mond Process - Monotropy Neodymium - Nichrome Nickel Carbonyl - Niobic Acid Nitrate (Saltpetre) - Nitrogen Solution Nitroso Sulphuric Acid - Nuclear isomers Octahedral Coordination - Open Shell Compound Organometallic Compounds - Osmic Acid Oxidising Agent (Oxidant) - Oxygen Absorbent Palladium Oxide - Pearl Hardening Periodic Law - Phosphagen Phosphonic Acid - Phosphorus Oxychloride Phosphorus Trichloride - Photosynthetic Pigments Polar Bond - Polar Solvent Polyatomic - Potassium Bifluoride Potassium Carbonate - Potassium (I) Fluoride Potassium Iodate(KIO₃) - Potassium Tetraiodocadmate Pseudohalogens - Radioactive Decay Rare Earth Salts - Relative Molecular Mass