Z IN

Z IN

( 506 )

is = 1.055. Of this folution 900 grains con-tain 53 grains of dry, or 82.6 grains of cryftal-lized acetat. One ounce by meafure of thefolution, weighs 506 grains, and contains 29.8grains of dry, or 46.5 grains of cryftallizedfait.

The fuccinic and benzoic acids form cryftal-lizable falts with zinc, the properties of whichhave not yet been examined.

Oxalic acid diflolves zinc with confiderableeffervefcence, and a white powder fubfides,which is Oxalat of zinc. It may alfo be pre-pared by adding oxalic acid to the fulphat, mu-riat, or nitrat of zinc. It is very fparinglyfoluble in water, uniefs an excefs of acid isprefent j it contains, according to Bergman,75 per cent, of metal.

Citric acid in like manner diflolves zinc witheffervefcence, and minute cryftalline grains aredepofited of Citrat of zinc: they have a flypticand metallic tafte, are little foluble in water,and conlift, according to Vauquelir., of50 Citric acid50 Oxyd of zinc '

100.

The falts formed by the other vegetable acidsand zinc are very little known.

There are two triple falts of zinc; the oneformed by digefting filings of the metal inmuriat of ammonia, the other by employinga folution of acidulous tartrite of potafli (creamof tartar). Neither of thefe falts is cryftalli-zable, nor are they decompofed by the pure orcarbonated alkalies.

'I'he neutral and earthy falts are many ofthem decompofable by zinc. Nitre and theother falts belonging to that genus detonaterapidly when heated with zinc. The alkalinefulphats are converted into fulphurets; andmuriat of ammonia is decompofetfi ammoniacalgas being given out, and the acid combiningwith the oxyd of zinc.

Very little affinity appears to exift betweenzinc and fulphur. As long as the former re-tains its metallic flate it cannot be made tocombine with fulphur by fufion or in any otherway. If zinc filings and flowers of fulphur bemade into a pafle with water, a decompofitionof this latter will take place, the metal will beoxydized, hydrogen gas will be given out, butthe refidual mafs will be a mere mixture offulphur and oxyd of zinc. A mixture of flow-ers of zinc and fulphur combine by fufion intoa ycllowifh-brown mafs, which has been com-

pared to blende. The alkaline fulphurets whenmelted with oxyd of zinc and afterwards dif-folved in water, let go the greateft part of theoxyd unaltered, they retain however a veryfmall portion. Water faturated with fulphu-retted hydrogen decompofes after fome timethe falts of zinc, forming a yellow precipitate,which is probably a hydrofulphuret. Proultpropofes the ufe of this re-agent to purify zincfrom copper and iron : the mixture being dif-folved in dilute nitric acid and duly neutralized,the hepatic water is to be carefully added till itceafes to produce a black precipitate; this ishydrofulphuret of copper, and may readily befeparated by filtration; to the clear liquor nowadd more of the hepatic water as long as anyyellow precipitate falls down ; this is the zinc:the iron remains in the folution.

Hydrogen appears capable of taking up aminute portion of zinc when it is produced bythe rapid adlion of dilute fulphuric acid on thismetal: this hydrogen burns with a fomewhatbrighter flame than common hydrogen.

Zinc combines readily with phofphorus, asPelletier has fhown, by adding to zinc, when infufion and covered with oil to prevent oxydation,a few pieces of phofphorus. The phofphuret ofzinc thus produced is of a whitifh colour and ametallic luftre not unlike lead. It is fomewhatmalleable, exhales a phofphoric odour byfriction, and in a high heat burns like commonzinc. Phofphorus alfo combines with the oxydof zinc: if a mixture confiding of 6 parts oxydof zinc, 6 parts vitreous phofphoric acid, andx part of, charcoal powder, is ftrongly heated inan earthen retort, a filvery-white vitreous mat-ter is fublimed, which, according to Pelletier, isphofphorized oxyd of zinc.

Zinc combines with many of the other metals,forming alloys, the greater number of whichhave been already defcribed.

Zinc and antimony unit£ by fufion, forminga compa£t homogeneous brittle mafs, of an afh-grey colour, and of lefs denfity than the meanof its ingredients.

Zinc with copper forms feveral importantalloys, for an account of which fee Brass andCopper , alloys of.

Zinc and Gold; fee Gold, alloys of

Zinc unites with iron by fufion, but not veryeafily on account of its volatility ; the refult isa hard fomewhat malleable alloy of a whitecolour approaching to that of fiber. Iron platemay alfo be covered with zinc in the famemanner as it is with tin.

Zinc and Lead 5 fee Lead, alloys of.