This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 Excerpt: ...soluble in boiling water (from which solution needle-shaped crystals of the salt are precipitated on cooling), insoluble in ammonia. (V) Sulphuric acid (H2SO4) throws down a heavy white precipitate of lead sulphate (PbSO4), insoluble in acids, but soluble in caustic soda or in an ammoniacal solution of tartaric acid ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 Excerpt: ...soluble in boiling water (from which solution needle-shaped crystals of the salt are precipitated on cooling), insoluble in ammonia. (V) Sulphuric acid (H2SO4) throws down a heavy white precipitate of lead sulphate (PbSO4), insoluble in acids, but soluble in caustic soda or in an ammoniacal solution of tartaric acid (H2C4H4O6). (c) Potassium iodide (KI) precipitates yellow lead iodide (PbI2), which is soluble in boiling water; on cooling, brilliant golden scales of the salt are precipitated. On examining these reactions, we notice that lead chloride is soluble in hot water, whereas the other chlorides of the group are insoluble; further, that silver chloride is dissolved by ammonia, mercurous chloride remaining undissolved, but being blackened by this reagent. A method of separation is thus easily framed.--Separation of Group I.--To a solution containing the three metals add hydrochloric acid, collect the ensuing precipitate on a small filter, wash it once or twice with cold water, remove it to a test-tube, and boil it with water; filter while hot, and to the filtrate add sulphuric acid; a white As lead chloride is sparingly soluble in cold water, traces of the metal will be present in the filtrate-and may be detected by the methods given under the next group. precipitate indicates lead (III. b.). Warm a little strong ammonia solution, and pour it over that portion of-the group precipitate which is insoluble in water; it is blackened, showing the presence of mercury (II. a). Acidulate the ammoniacal filtrate with nitric acid a white precipitate tells you that silver is present (I. a). Special Reactions For Members Of Group II. I. Mercury.--Mercuric nitrate, Hg(NO3)2, is used. 1. Dry Reactions.--Same as those for mercurous compounds. (See p. 108.) 2. Wet Rea...
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Seller's Description:
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