Potassium-iodide sentence example

potassium-iodide
  • This acid may also be prepared by the electrolysis of concentrated sulphuric acid, and it is distinguishable from persulphuric acid by the fact that it immediately liberates iodine from potassium iodide.
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  • Its solution liberates chlorine from hydrochloric acid and iodine from potassium iodide.
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  • Its aqueous solution gradually decomposes with evolution of oxygen, behaves as a strong oxidant, and liberates iodine from potassium iodide.
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  • The combination, as it is ordinarily termed, of chlorine with hydrogen, and the displacement of iodine in potassium iodide by the action of chlorine, may be cited as examples; if these reactions are represented, as such reactions very commonly are, by equations which merely express the relative weights of the bodies which enter into reaction, and of the products, thus Cl = HC1 Hydrogen.
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  • KI -ICl = KC1 + I Potassium iodide.
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  • Potassium iodide.
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  • Stannous iodide, Sn12, forms yellow red needles, and is obtained from potassium iodide and stannous chloride.
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  • The corresponding iodides are obtained by the addition of potassium iodide to solutions of the sulphonates, and are optically active antipodes.
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  • Aurous iodide, Aul, is a light-yellow, sparingly soluble powder obtained, together with free iodine, by adding potassium iodide to auric chloride; auric iodide, Au13, is formed as a dark-green powder at the same time, but it readily decomposes to aurous iodide and iodine.
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  • This salt is very deliquescent; it melts at 45°, and at 100° decomposes into iodine and potassium iodide.
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  • The action of potassium bromide and potassium iodide has been treated under bromine and iodine (q.v.).
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  • Commercial iodine may be purified by mixing it with a little potassium iodide and then subliming the mixture; in this way any traces of bromine or chlorine are removed.
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  • Stas recommends solution of the iodine in potassium iodide and subsequent precipitation by the addition of a large excess of water, the precipitate being washed, distilled in steam, and dried in vacuo over solid calcium nitrate, and then over solid caustic baryta.
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  • It can be estimated quantitatively by mixing a dilute solution with potassium iodide and hydrochloric acid in excess, adding excess of zinc sulphate, neutralizing the excess of free acid with sodium bicarbonate, and determining the amount of free iodine by a standard solution of sodium thiosulphate.
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  • Strychnine is incompatible with liquor arsenicalis and potassium iodide.
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  • In the case of iodine, the substitution is effected by adding a warm solution of potassium iodide to the diazonium solution, no copper or cuprous salt being necessary; whilst for the production of nitriles a solution of potassium cuprous cyanide is used.
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  • Thallous iodide, T11, is obtained as a yellow precipitate, which requires 16,000 parts of cold water for its solution, by the addition of potassium iodide to a solution of a thallous salt, or by the direct union of its components.
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  • Cuprous iodide, Cu 2 l 21 is obtained as a white powder, which suffers little alteration on exposure, by the direct union of its components or by mixing solutions of cuprous chloride in hydrochloric acid and potassium iodide; or, with liberation of iodine, by adding potassium iodide to a cupric salt.
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  • When potassium iodide is added to a solution of cupric acetate, the reaction (Cu(C 2 H 3 0 2) 2 + 2KI= Cul + 2K(C 2 H 3 0 2) + I takes place; that is, for each atom of copper one atom of iodine is liberated.
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  • Next 5 cc. of glacial acetic acid are added, the solution cooled, and 5 cc. of a solution of potassium iodide (300 grammes to the litre) and the standard solution of sodium thiosulphate run in from a burette until the brown colour has nearly disappeared.
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  • A few drops of starch solution are then added, and when the blue colour has nearly vanished a drop or two of methyl orange makes the end reaction very sharp. The thiosulphate solution is standardized by dissolving o 3 to o 5 gramme of pure copper in 3 cc. of nitric acid, adding 50 cc. of water and 5 cc. of ammonia, and titrating as above after the addition of 5 cc. of glacial acetic acid and 5 cc. of the potassium iodide solution.
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  • (r) Argenti nitras (United States and British pharmacopoeia), lunar caustic, incompatible with alkalis, chlorides, acids, except nitric and acetic, potassium iodide and arsenical solutions.
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  • using potassium iodide and sodium chlorate(I) solutions Sodium chlorate(I) is also known as sodium hypochlorite.
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  • Iodine has no action on osmium, but on warming the tetroxide with a mixture of potassium iodide and hydrochloric acid a deep emerald green colour is produced, due to the formation of a compound 0s12.2H1; this reaction is a delicate test for osmium (E.
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  • This salt is very deliquescent; it melts at 45°, and at 100° decomposes into iodine and potassium iodide.
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  • OH, is obtained by oxidizing potassium iodide with sulphuric acid and potassium permanganate (A.
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