Thallic hydroxide, TI OH 31 is obtained as a brown precipitate by adding a hot solution of thallous chloride in sodium carbonate to a solution of sodium hypochlorite. Sulphuretted hydrogen, in the presence of free mineral acid, gives no precipitate ; sulphide of ammonium, from neutral solutions, precipitates T12S as a dark brown or black precipitate , insoluble in excess of reagent.
The precipitate is dissolved in boiling water, decolorized by potassium permanganate and decomposed by barium carbonate.
Urea may be recognized by its crystalline oxalate and nitrate, which are produced on adding oxalic and nitric acids to concentrated solutions of the base; by the white precipitate formed on adding mercuric nitrate to the neutral aqueous solutions of urea; and by the so-called "biuret" reaction.
On the other hand, the climates of the east are dry, because the surface is lower and more level; and the breezes borne thither from the west, being robbed of most of their superabundant moisture in crossing the western hills, are drier and precipitate a greatly diminished rainfall. They are readily decomposed by mineral acids with the production of benzoic acid, and on addition of ferric chloride to their neutral solutions give a reddish-brown precipitate of ferric benzoate.
Manganous hydroxide, Mn OH 2, is obtained as a white precipitate on adding a solution of a caustic alkali to a manganous salt. In the presence of ammonium salts the precipitate is dirt y white in colour, whilst in the presence of free ammonia it is a buff colour.
By the addition of caustic soda to cerous salts, a white precipitate of cerous hydroxide is formed. Cerium compounds may be recognized by the red precipitate of ceric hydroxide, which is formed when sodium hypochlorite is added to a colourless cerous salt.
For the quantitative determination of the metal, the salts are precipitated by caustic potash, the precipitate washed, dried and heated, and finally weighed as the dioxide. With Die Leiden des jungen Werthers , the literary precipitate of the author's own experiences in Wetzlar, Goethe succeeded in attracting, as no German had done before him, the attention of Europe. The operation is finished when all the sodium sulphide has been converted into normal sodium carbonate, partly also into acid sodium carbonate bicarbonate NaHCO 3; at the same time a precipitate is formed, consisting of ferrous sulphide, alumina and silica, which is removed by another settling tank, and the clear liquor is now ready either for boiling down in a " fishing-pan " for the manufacture of white soda-ash, or for the process of causticizing.
The metal is obtained from zinc blende which only contains it in very small quantity by dissolving the mineral in an acid, and precipitating the gallium by metallic zinc. The precipitate is dissolved in hydrochloric acid and foreign metals are removed by sulphuretted hydrogen; the residual liquid being then fractionally precipitated by sodium carbonate, which throws out the gallium before the zinc.
This precipitate is converted into gallium sulphate and finally into a pure specimen of the oxide, from which the metal is obtained by the electrolysis of an alkaline solution. Potassium ferrocyanide gives a precipitate even in very dilute solution. In neutral solutions, zinc gives a precipitate of gallium oxide. The caustic alkalis added to solutions of nickel salts give a pale green precipitate of the hydroxide, insoluble in excess of the precipitant. Ammonium sulphide precipitates black nickel sulphide, which is somewhat soluble in excess of the precipitate especially if yellow ammonium sulphide be used , forming a dark-coloured solution.
Ammonium hydroxide gives a green precipitate of the hydroxide, soluble in excess of ammonia, forming a blue solution. Knorre Ber. We cannot take first principles " as the bare precipitate of a progressively refined analysis " 3 nor on the other as constitutive a.
Tungsten may be prepared from wolfram by heating the powdered ore with sodium carbonate, extracting the sodium carbonate with water, filtering and adding an acid to precipitate tungstic acid, H 2 W0 4. The metatungstates of the alkalis are obtained by boiling normal tungstates with tungstic acid until the addition of hydrochloric acid to the filtrate gives no precipitate.
It may be distinguished from the isomeric ethylene succinic acid by the fact that its sodium salt does not give a precipitate with ferric chloride. Sulphur dioxide is then blown in, and the precipitate is treated with iron, which produces metallic copper, or milk of lime, which produces cuprous oxide.
Other precipitants such as sulphuretted hydrogen and solutions of sulphides, which precipitate the copper as sulphides, and milk of lime, which gives copper oxides, have not met with commercial success. It is obtained as a fine red crystalline precipitate by reducing an alkaline copper solution with sugar. Cupric hydroxide, Cu OH 2, is obtained as a greenish-blue flocculent precipitate by mixing cold solutions of potash and a cupric salt. This precipitate always contains more or less potash, which cannot be entirely removed by washing.
The oxychloride Cu 3 0 2 C1 2. It may be prepared by heating cuprous sulphide with sulphur, or triturating cuprous sulphide with cold strong nitric acid, or as a dark brown precipitate by treating a copper solution with sulphuretted hydrogen. Ammonia gives a characteristic blue coloration when added to a solution of a copper salt; potassium ferrocyanide gives a brown precipitate , and, if the solution be very dilute, a brown colour is produced.
Copper precipitate is taken from water pumped up from old copper mines on Parys Mountain in Anglesey. And as his deeds are, so shall be his fate and his future lot on the Day of Judgment; when he must cross the Bridge Cinvat, which, according to his works, will either guide him to the Paradise of Ahuramazda or precipitate him to the Hell of Ahriman.
Calcium chloride gives a white precipitate of calcium tartrate in neutral solutions, the precipitate being soluble in cold solutions of caustic potash but re-precipitated on boiling. In solution, barium salts may be detected by the immediate precipitate they give on the addition of calcium sulphate this serves to distinguish barium salts from calcium salts , and by the yellow precipitate of barium chromate formed on the addition of potassium chromate.
Some of these are of mineral and some of vegetable origin, but they almost all possess one chemical property in common, namely, they precipitate albumin. When passed into silver nitrate solution it gives a black precipitate of silver antimonide, SbAg 3.
It is soluble in alcohol and in carbon bisulphide, and also in a small quantity of water; but with an excess of water it gives a precipitate of various oxychlorides, known as powder of algaroth. It forms a yellowish crystalline precipitate which in moist air goes to a thick liquid.
In June the expedition of General Santa Cruz, prepared with great zeal and activity at Lima, marched in two divisions upon Upper Peru, and in the following months of July and August the whole country between La Paz and Oruro was occupied by his forces; but later, the indecision and want of judgment displayed by Santa Cruz allowed a retreat to be made before a smaller royalist army, and a severe storm converted their retreat into a precipitate flight, only a remnant of the expedition again reaching Lima.
The question has, however, been raised whether the toxin is really itself a proteid, or whether it is not merely carried down with the precipitate.
It does not form a precipitate with lead acetate solution, as the isomeric pyrocatechin does. The resulting precipitate of silver chloride is filtered, and the residue and the precipitate are scorified together. The molybdate solution should be of such a strength that i cc. The solution is filtered to get rid of the precipitate , and the titration is finished in the nearly clear filtrate, which should be always about cc. Tannic acid, for instance, precipitates codeine as a tannate, salts of many of the heavy metals form precipitates of meconates and sulphates, whilst the various alkalis, alkaline carbonates and ammonia precipitate the important alkaloids.
If the sodium cuprous hyposulphite was used as a solvent in addition to the simple sodium hyposulphite, cuprous sulphide will be precipitated with the silver sulphide, and the precipitate will be of lower grade.
It is readily obtained as a white curdy precipitate by adding a solution of a chloride to a soluble silver salt.
It is obtained as a yellowish white precipitate by mixing solutions of a bromide and a silver salt. In the imposition of an export duty on ivory excited much ill-will, and when it became known that, in his march towards the Nile, van Kerckhoven had defeated an Arab force, the Arabs on the upper Congo determined to precipitate the conflict.
A colloidal selenium was obtained by C. Paal and C. Koch Ber. This method is to exhaust the powdered bark with water acidulated with hydrochloric acid and then to precipitate the alkaloids by caustic soda. Lithium carbonate, Li 2 CO 3, obtained as a white amorphous precipitate by adding sodium carbonate to a solution of lithium chloride, is sparingly soluble in water.
To occupy the one defensible position in the station, the magazine by the river with its vast military stores and its substantial masonry walls, would have involved steps which Wheeler regarded as certain to precipitate an outbreak. Silver nitrate in the presence of nitric acid gives with bromides a pale yellow precipitate of silver bromide, AgBr, which is sparingly soluble in ammonia.
It phosphoresces in ozone, but not in air, and is nonpoisonous; from its solution in alcoholic potash acids precipitate the hydride P 12 H 6, and when heated it is transformed into the red modification. With silver nitrate it gives a white precipitate , Ag4P Sodium monothiophosphate, Na 3 PSO 3. Unlike tannic acid, gallic acid does not precipitate albumen or salts of the alkaloids, or, except when mixed with gum, gelatin.
This letter was precipitate and unfortunate. A rain-cloud raised vertically upwards expands, cools and tends to precipitate ; but in the actual passage of rain-clouds over the surface of the earth other influences are at work. At the extreme left the rain-clouds are thrown up, and if this were all, they would precipitate a larger proportion of the moisture Since the above was written, this work has been taken over by the " British Rainfall Organization.
In solution, sulphates are always detected and estimated by the formation of a white precipitate of barium sulphate, insoluble in water and all the common reagents. It served, however, to precipitate the crisis on the continent of Europe; the great army assembled at Boulogne was turned eastwards; by the capitulation of Ulm October 19 Austria lost a large part of her forces; and the last news that reached Pitt on his A t lit death-bed was that of the ruin of all his hopes by the US er Z crushing victory of Napoleon over the Russians and Austrians at Austerlitz December 2.
It dissolves in acids to form a mixture of a ferrous and ferric salt,' and if an alkali is added to the solution a black precipitate is obtained which dries to a dark brown mass of the composition Fe OH 2Fe; this substance is attracted by a magnet, and thus may be separated from the admixed ferric oxide. The monohydrate also results as a white precipitate when concentrated sulphuric acid is added to a saturated solution of ferrous sulphate.
Alcohol also throws down the salt from aqueous solution, the composition of the precipitate varying with the amount of salt and precipitant employed. It may be obtained artificially as a white precipitate , which rapidly turns blue or green on exposure, by mixing solutions of ferrous sulphate and sodium phosphate.
Normal ferric phosphate, FePO4. A basic ferric arsenite, 4Fe2O3 As2O3. An acid arsenate, 2Fe2 HAsO4 3. Ferrous sulphate and sodium carbonate in the cold give a flocculent precipitate , at first white but rapidly turning green owing to oxidation.
A soluble carbonate and a ferric salt give a precipitate which loses carbon dioxide on drying. Ferrous salts give a greenish precipitate with an alkali, whilst ferric give a characteristic red one. Ferrous salts also give a bluish white precipitate with ferrocyanide, which on exposure turns to a dark blue; ferric salts are characterized by the intense purple coloration with a thiocyanate.
It is a strong reducing agent, giving a precipitate of cuprous oxide from alkaline copper solutions at ordinary temperature, converting mercuric chloride to mercurous chloride, and precipitating metallic silver from solutions of silver salts. Where the disease is endemic or is prevailing epidemically, it is of great importance to use all preventive measures, and for this purpose the avoidance of all causes likely to precipitate an attack is to be enjoined.
Under like conditions arsenates only give a precipitate on long-continued boiling. A neutral solution of an arsenite gives a yellow precipitate of silver arsenite, Ag3AsO3, with silver nitrate solution, and a yellowish-green precipitate Scheele's green of cupric hydrogen arsenite, CuHAsO3, with copper sulphate solution. The salts of arsenic acid, termed arsenates, are isomorphous with the phosphates, and in general character and reactions resemble the phosphates very closely; thus both series of salts give similar precipitates with "magnesia mixture" and with ammonium molybdate solution, but they can be distinguished by their behaviour with silver nitrate solution, arsenates giving a reddish-brown precipitate ,whilst phosphates give a yellow precipitate.
The precipitate is strained off, and the patient can swallow it suspended in water. He attempted to precipitate matters by a sudden attack, and in the spring of nearly captured the emperor Otto II. The hour had come for Dante, the great Florentine poet, to curse the man who was to dismember the empire, precipitate the fall of the papacy and discipline feudalism. His journey was long and triumphant, and his return precipitate ; indeed it very nearly ended in a disaster at Fornovo, owing to the first of those Italian holy leagues which at the least sign of friction were ready to turn against France.
The philosophers only helped to precipitate a movement which they had not created; without pointing to absolute power as the cause of the trouble, and without pretending to upset the traditional system, they attempted to instil into princes the feeling of new and more preciseobligations towards their subjects. The ceremony, however, did not take place owing to the emperor's precipitate flight by night September , occasioned by his displeasure at the duke's attitude. Although he had no desire to raise the theological issue, it must be admitted that, the discussion once set on foot, he threw himself into it with characteristic impetuosity, and thus helped to precipitate a decision which it was his interest to avert.
The hydroxide, In OH 3j is prepared, as a gelatinous precipitate , by adding ammonia to any soluble indium salt. Part of it only is soluble in water, and that resembles gummic acid in being precipitated by alcohol and ammonium oxalate, but differs from it in giving a precipitate with neutral lead acetate and none with borax.
This may precipitate lactic acidosis in patients who are taking metformin. Right heart insufficiency and pulmonary hypertension may precipitate bradycardia and systemic hypotension, when the organic iodine solution is injected.
They may also precipitate bronchospasm or induce attacks of asthma in susceptible subjects. It lies in our willingness and capacity to create global catharsis in a creative way, to precipitate change by choice. Trawlers, the strip miners of the sea, often precipitate the collapse of fish stocks from years of over-harvesting. Oxygen in the air oxidizes the iron II hydroxide precipitate to iron III hydroxide precipitate to iron III hydroxide especially around the top of the tube.
Heavy CO 2 saturated water descends through lighter formation water and carbonate minerals gradually precipitate driven by ionic equilibrium. For example: A primary iodo compound produces a precipitate quite quickly. Because of the lack of charge, the neutral complex isn't soluble in water, and so you get a pale blue precipitate. Addition of hydrogen peroxide produces lots of bubbles of oxygen and a dark chocolate brown precipitate. Sentences Mobile Most changes are precipitated by a steady movement of critical mass.
Nor was it clear exactly what finally precipitated the bankruptcy case. His assassination the next day in Sarajevo precipitated World War I. That precipitated more than three decades of rule by military leaders.
That precipitated a sharp drop in market share and hurt earnings. The pool suffered heavy losses in , precipitating the bankruptcy. The words' etymologies overlap as well.
Both ultimately come from Latin praeceps, which means "headlong. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'precipitate.
Send us feedback. Latin praecipitatus , past participle of praecipitare , from praecipit-, praeceps — see precipice. New Latin praecipitatum , from Latin, neuter of praecipitatus — see precipitate entry 1. See more words from the same year.
Accessed 11 Nov. More Definitions for precipitate. English Language Learners Definition of precipitate Entry 2 of 3. English Language Learners Definition of precipitate Entry 3 of 3. See the full definition for precipitate in the English Language Learners Dictionary. Nglish: Translation of precipitate for Spanish Speakers. Britannica English: Translation of precipitate for Arabic Speakers.
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