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Updated: June 21, 2025
Dilute acid chars paper when the paper is heated; gives a white precipitate with nitrate or chloride of barium, and is entirely volatilized by heat. Dilute solutions give a white precipitate with barium nitrate, insoluble in hydrochloric acid even on boiling. Fatal Dose. In an adult, 1 drachm. Fatal Period.
Whereas he had worked with intra-atomic energy schoolboy fashion, the master craftsman before him knew every reagent, every reaction, and worked with known and thoroughly familiar agencies to bring about his exactly predetermined ends just as calmly certain of the results as Seaton himself would have been in his own laboratory, mixing equivalent quantities of solutions of barium chloride and of sulphuric acid to obtain a precipitate of barium sulphate.
Similar conditions prevail when, for example, silver ions react with chloride ions, or barium ions react with sulphate ions. For the sake of accuracy it should be stated that the mass law cannot be rigidly applied to solutions of those electrolytes which are largely dissociated.
The action of these three different sets of rays upon certain substances is not the same, the beta and gamma rays acting strongly upon barium platinocyanide, but feebly on Sidot's blende, while the alpha rays act exactly the reverse of this, acting strongly on Sidot's blende. If a surface is coated with Sidot's blende and held near a piece of radium nitrate, the coated surface begins to glow.
The relative power of radium to the X-ray is as six to one. The rays of radium have one hundred thousand times the energy of those of uranium and over one hundred times the energy of barium radiation. The scarcity of the metal will be understood when it is stated that there is far less radium in pitchblende than gold in ordinary sea water.
So then he tried a little calcium, aluminum, barium, and strontium, a little clear bitumen, and a half of a third of a sixteenth of a grain of arsenic. This gave rather a pretty color; but still Mrs. Peterkin ungratefully said it tasted of anything but coffee. The chemist was not discouraged.
The insoluble barium and radium sulphates, after being converted into chlorides or bromides, are separated by repeated fractional crystallization. One kilogram of impure radium bromide is obtained from a ton of pitchblende residue after processes continued for about three months during which time, five tons of chemicals and fifty tons of rinsing water are used.
Sulphide sulphur was determined in a sample of reduced barium sulphate by the evolution method, in which the sulphur was evolved as hydrogen sulphide and was passed into CdCl solution, the acidified precipitate being titrated with iodine and thiosulphate. Sample, 5.076 grams; cc. I = 20.83; cc. Na S O = 12.37; 43.45 cc. Na S O = 43.42 cc. I ; 8.06 cc. KMnO = 44.66 cc. Na S O ; 28.87 cc.
It is described by her as a white, hard, metal-like solid, which reacts with water at the ordinary temperature, as barium does. Since the discovery of radium compounds, many radio-active substances have been isolated. Only exceedingly minute quantities of any of them have been obtained.
I have here specimens of various bromides which can be employed, such as ammonium, potassium, barium, and zinc bromides; as a rule, however, either the ammonium or potassium salt is used, and I should like to say a few words respecting the relative efficiency of these two salts. As to ammonium bromide. This substance is a highly unstable salt.
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