. Transactions. )recipitated copper, and carry out the titra-tion in the usual manner. If the copper is in a finely-dividedcondition as a precipitate on the aluminum, it will adhere as ablack coating on the thimble, but as soon as the thimble is dis-. FiG. 1.—The Alundum Extraction-Thimble as Used in theDetermination of Copper. connected the water inside it will ooze out through the pores,and if the 6 cc. of strong nitric acid be poured on it, the copperwill immediately dissolve and the thimble may be washed witha jet of hot water. The filtration is more rapid when the solu-tion is hot. If the
. Transactions. )recipitated copper, and carry out the titra-tion in the usual manner. If the copper is in a finely-dividedcondition as a precipitate on the aluminum, it will adhere as ablack coating on the thimble, but as soon as the thimble is dis-. FiG. 1.—The Alundum Extraction-Thimble as Used in theDetermination of Copper. connected the water inside it will ooze out through the pores,and if the 6 cc. of strong nitric acid be poured on it, the copperwill immediately dissolve and the thimble may be washed witha jet of hot water. The filtration is more rapid when the solu-tion is hot. If the last of the solution in the beaker is not withdrawn asrapidly as the first, tiji the beaker at an angle of 45°. With apum}» having a strong suction this will not be necessary. The thimble attached to the flask, as shown above, was usedin more than 300 determinations. THE SAMPLING OF GOLD-BULLIOX. 853 The Sampling of Gold-Bullion.* BY FREDERIC P. DEWEY, WASHINGTON, D. (Cleveland Meeting, October, 1912.) At the Seventh International Congress of Applied Chemis-try I presented a paper/ The Assay and Valuation of Gold-Bullion, in which are briefly mentioned a few illustrations ofdifferent methods of sampling gold-bullion, particularly cyani
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
