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Show or Tartar, Pore Cansonate oF PoTAsH, FORMERLY Sanur E.) (Carbonas Potasse Purissimus, olim Sal Tartari. ty: Take of impure super-tartrate of potash, any quanti crucible, a into it put or paper, us Wrap it up in a moist bibulo it among live coals. and burn it into a black mass, by placing in an open cru. Having reduced this mass to powder, exposeit w hite, or at cible to the action of a moderate fire till it become melt. Then least of an ash-graycolour, taking care that it do not through alinen cloth, dissolve it in warm water ; strain the liquor stirring it, toand evaporateit in a clean iron vessel, diligently with an iron spatula, to prevent wards the end of the process, very white salt it fromsticking to the bottom of the vessel. A fire, till the the on longer alittle will remain, which is to be left esalt whenth , Lastly red. almost es bottom ofthe vessel becom d. stoppe well vessels glass is grown cold, keep it in contain a The potash of commerce we have already shownto process directed considerable proportion offoreign salts. By the crystallizable; bythe collegesit is purified from those which are silica, it is and and, althoughit still contains muriate of potash sufficiently pure for the purposes of medicine. furnace for half an hour. mixture affords beautiful permanent crystals of carbonate of pot: ash. In this state it consists of about 43 acid, 40 potash, and 17 water. The saturation with carbonicacid is one of the; best E means of pu purifying the sub-car ate of of potash, ying the 7 i always. sub carbonate for it separates silica from the uncombinedalkali. MEDICAL. USE. Carbonate of potash is frequently employed in medicine, in conjunction with other articles, particularly for the formation of saline neutral draughts and mixtures: but it is used also by a 7 at ry i i } itself, in doses from three or fourgrains to fifteen or twenty; and it frequently operates as a powerful diuretic, particularly when aided by proper dilution. ‘ ; Pa : Warer or Prepareo Kaur. (Aqua Kali Preparati. L.) ; Take of prepared kali, one pound; Set it in a moist placetill it deliquesce, and thenstrainit. Warer or Sus-carponate or Kart. (Aqua Sub-carbonatis n use is that obThe. purest carbonate of potash in commo are destroyed, the heat.” The tartaric acid and colourmg matter with the unites , formed is which acid, ic and part of the carbon a Let the solution be caught in a vessel placed under it. his is the old oleum tartari per deliquium, and is a solution e carbonate of potash in a variable quantity of water; for, by potash. is not strictly eBut this salt, in whatever way obtained, * 263 i fcae te fs Bylixiviation and crystallization the Kali. D.) Take of sub-carbonate of kali, any quantity Place it in a wide glass funnel, whose throat is obstructed with a of potash, asall tained byincinerating the impure super-tartrate decomposed by are , potash the the substances it contains, except eg og cy PRICKLY SALTWORT, PRICKLY SALTWORT. 262 it is not saturated titled to the appellation of carbonate; for carbonate of potash with the acid, or rather it is a mixture of is owing to the uncom and potash, in variable proportions. It in some degree bined potash that it is still deliquescent, and with carbonic r, howeve ted, caustic. Jt may beeasily satura theair fora of t contac the to acid, by exposing it, in solution, ic acid ga carbon of stream a g considerable time, or by makin with carbonate it ing distill by or it, of on soluti a pass through r modeol ra of ammonia. M. Curadau has proposed a cheape He dissolves the potash urating potash with carbonic acid. with as much dried a sufficient quantity of boiling water, mixes it then exposes He and tanners’ bark as to makeit pretty dry, a reverberatory mixture, in a covered crucible, to the heat of a reverberatoly ‘ * 1 y } rag. Set this in a cellar, that the salt maydeliquesce in the moist ‘saciee to the air, the sub-carbonate attracts not only water put carbonic acid. SOLUTIO TIONN o¥oF SupERoR CARBONATE or jPorasu. carbonatis Potasse. E.) (Aqua Super. m1, Take of water, ten pounds ; eo pure Carbonate of potash, one ounce: Dissolve, he and expose the solution to a stream of carbonic acid, arising from . Carbonate of lime in powder, Sulphuric ac} ilphuric acid, each three ounees ; : Waterr, » three res and cautiously eat mixed. : three pounds,eae gradually ¢ * € chemical apparatus invented by Dr. Noothis well adapted The chemic: for this Wepare : Mave Me : ation, ‘ sf lar = ‘ But, if a9 larger quantity of the liquor be ) tie apparatus of Dr. Woulfe is preferable. |