Magnesia Sulphate

The precipitate is dissolved by excess of potassic hydrate. CryataUmd mcic lu hak is isomorphous with ciystallized magnesic sulphate, aud contains seven molecules of wito,B)x of which are ea y expelled at a moderate heat, the last only being driven off at a somewhat high temperature. It fdso resembles magnesia sulphate in forming doable salts with potassic and ammonio sulphates... 

Magnesia Sulphate of Magnesia 5 Magnesia Vitriol of Magnesia Epsom Salt, Sedlitz Salt... 

Qualitative Examination.—This is carried out as with English red and iron minium as far as the detection of calcium sulphate, carbonates, silica, barium sulphate, ferric oxide and alumina, manganese, lime, magnesia, sulphates and artificial organic dyes is concerned. 

In addition to soln. of chloride of lime—lime bleach liquor—bleaching liquids with magnesium, zinc, or aluminium hypochlorites as the active agents have also been made and special virtues claimed for their use. For example, if magnesium sulphate be added to a soln. of bleaching powder, calcium sulphate is precipitated and a soln.—magnesia bleach liquor—of magnesium hypochlorite can be decanted off similarly with zinc hypochlorite—zinc bleach liquor and with aluminium hypochlorite—alumina bleach liquor, or Wilson s bleach liquor. 

Magnesium Basic Carbonate (Magnesia Alba). Add a sodium carbonate solution to a magnesium sulphate or chloride solution heated to 50 °C up to complete precipitation. What is the composition of the precipitate Filter off the latter, wash it with water, and dry it in a drying cabinet at 100-150 °C. Heat the filtrate up to boiling. What do you observe Write the equations of the reactions. 

This oxide occurs in nature as carbonate, forming immense masses of roclr in various parts of the globe also associated with carbonate of lime under the forms of dolomite and maguosian limestone and as sulphate of magnesia—Epsom salts—occurring in many saline springs. 

Sulphate of magnesia is also obtained by the action of sulphuric acid upon calcareous rocks rich in carbonate of magnesia, such as dolomite. The compound is calcined, and reduced to powder by being aspersed with water it is then diffused through water, and sulphuric acid is added sulphate of lime and sulphate of magnesia are formed, the one barely soluble in water, and the other very much so consequently, they are readily separated. 

Which, by crystallization, produces a crude sulphate ol magnesia, called Rough Epsom8, and having the fallowing composition — . ... 

The sulphate, of magnesia liquor is subsequently clarified in the manner previously described, and crystallized in the usual hollow pans. When the liquid has drained off from the crystals, they are removed to a stove, and exsiccated at a low temperature. In this... 

From Native Carbonate of Magnesia-—Mr. Chance has lately imported a very pure natural carbonate of magnesia from the Mediterranean, to which he adds sulphurio acid, and proceeds in the usual way for the production of the sulphate and having1, it is understood, secured the entire produce of the mice, he is likely to become a formidable competitor to the other manufacturers,... 

The sulphate of magnesia crystallizes in right prisms, which at 60° are eolublo in their own weight of water. When exposed to the ait, they effloresce, and am reduced to powder. The intensely bitter taste of this salt is well-known. It is composed of,—... 

As a purgative, it is usually administered in doses of from half an ounce to an ounce and a half but if token in the morning, fasting, a smaller dose will suffice. Sulphate of magnesia is extensively used by veterinary surgeons.—Pereira,... 

Braude states, that the salts of magnesia are mostly soluble in water, and bitter they are all soluble in hydrochloric acid their aqueous solutions are precipitated by potassa and soda, the precipitate, being soluble In hydrochloric, nitric, and sulphuric acids, and in hydroohlorate, nitrate, and sulphate of ammonia. Ammonia only throws down part of the magnesia, and forms a double salt, and carbonates of potassa and soda only throw down part of the magnesia, except the solution be hentad, when pearly the whole is precipitated. Chloride of ammonium redissolves tiro deposit, and when previously added to the magnesian solution, no precipitate ensues on adding the alkaline carbonates, unless the liquor be warmed The bicarbonates of von. ir. 

To estimate as pyrophosphate of magnesia, a weighed portion is taken, and treated with nitrie acid until entirely dissolved. The solution is mixed with a considerable exoess of ammonia chloride of ammonium is then added and lastly, sulphate of magnesia, as long as a procipitete continues to be formed. The mixture is allowed to stand twelve hours the deposit of phosphate of magnesia and ammonia is then collected by filtration, and well washed with dilute solution of ammonia, dried, and heated to intense redness, to expel all traces of ammonia. Every one hundred parts of pyrophosphate are equal to 28 16 of phosphorus. 

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