Vitriol, green

Chemical Designations - Synonyms Copperas, Green vitriol, Iron(ous) sulfate. Iron vitriol Chemical Formula FeS04 7H20. 

Copperas [green vitriol or ferrous sulfate (FeS04 7H20)] was also employed as an external coagulant (at pH values of approximately 7.7). It forms a turbid precipitate, and when oxygen is present (as is usual), a slimy precipitate of ferrous hydroxide also may form in addition to ferric hydroxide ... 

The name of compounds whose molecules contain three or more elements, usually including oxygen, ends in the suffix ate. Thus the chemical name for limestone, whose chemical formula is CaC03, is calcium carbonate. That of green vitriol, also known as copperas, whose formula is FeS04, is iron sulfate. The names and formulas of some chemical compounds related to archaeological studies are listed in Table 7. 

Also known as black iron oxide iron monoxide. fer as ak.sTd ferrous sulfate inorgchem FeS04-7H20 Blue-green, water-soluble, monoclinic crystals used as a mordant in dyeing wool, in the manufacture of ink, and as a disinfectant. Also known as copperas ferrisulphas green copperas green vitriol iron sulfate. fer as sal,fat ... 

Formula FeS04 MW 151.91 Synonyms ferrous sulfate green vitriol... 

Pyrite, Green Vitriol, and Ocher. In 1579 Matthias Falconer of Brabant founded at Queenborough the first plant in England for converting iron pyrites into copperas (ferrous sulfate, or green vitriol) and... 

In 1821 John Locke described a pyrite mine and copperas plant at Strafford, Vermont. To facilitate crystallization of the green vitriol, branches of trees were put into the evaporating cisterns as nuclei for the crystals. The branches, said Locke, have a fine crop of foliage and fruit composed of beautiful green crystals.. . . Everything about this mineral manufactory is curiously reddened with iron rust. When a dry... 

The first industrial preparation of sulfuric add from green vitriol (ferrous sulfate), according to Hermann Kopp, was by Johann Christian Bernhardt in 1755 (9,10). A fuming sulfuric acid known as Nordhausen oil of vitriol was manufactured at Nordhausen, Thuringia, from partially dehydrated green vitriol (11). 

Ferrous Sulfate (Iron Sulfate or Green Vitriol), FeS04.7H P mw 278.03i blue-gm monocl cry sts, sp gr 1.899 at 18.8°, mp 64 —7HaO at 300° sol in w, insol in ale. Can be prepd by the action of dil. sulfuric acid on iron or by other methods. Used in lab for detn of inorg or org nitrates (See next item)... 

The acid was prepared chiefly from the green vitriol (the cheapest) simply by heating and condensing the sulfur oxides driven oflF. The solid colca-thar (an iron oxide) remaining in the crucible had its own medicinal uses and the yield of acid was known to be higher when the humidity was also high. 

GeoflFroy went on to describe how he distilled green vitriol in a cracked crucible so that the Volatile sulphureous acid spirit of vitriol [sulfur dioxide] could escape, all this following the procedure of Stahl. GeoflFroy advised his readers who wanted this explained to consult Stahls original paper in the Journal of Halle in Saxony.Georg Ernst Stahl (1660-1734) is the inventor of the phlogiston theory that we will be centrally concerned with a little later. This reference to Stahl in 1713 is the earliest that I have found in the Paris Academy Memoires. 

An excess of protosnlphata of iron in solution is then added to the auriferous solution in the propoi> tion of four or five parte of. tho crystallized protosulphate—green vitriol—to one of gold and the mixture is put in a warm place, and allowed to stand for several hours. In the reaction which occurs, the chlorine that was combined with the gold unites with a portion of... 

But the only salt6 of iron of great commercial importance are the protosulphate or green vitriol, and the double haloid salt, the ferrocyanide of iron, better known as prusdan blue. To these the Editor-will, therefore, confine his attention iu what follows but, In connection with the latter, it will be necessary to describe the preparation of another important salt, in which iron occurs as an element, the sesqttiferro-cyanide of potassium, known commercially as prumate of potassa. 

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