A Manual of Practical Assaying |
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Common terms and phrases
acetic acid added alkaline allowed alumina ammonia ammonium amount analysis antimony apparatus arsenic assay barium beaker boiling bottle bullion burette calcium calculated carbonic acid casserole cent Chapter chloride cipitate cold color containing contents cool copper crucible cubic centimetres cupel decomposed determined dilute dish dissolved distilled water drops equation ferric filter filter-paper filtrate flask flux fumes furnace fused fusion glass gold grammes H₂O heat hot water hydrate hydrochloric acid hydrogen ignited insoluble residue iron lead button liquid magnesia manganese matte metallic method milligrammes minutes molybdate necessary nitric acid obtained oxalic acid oxide percentage permanganate solution platinum potassium chlorate potassium permanganate pounds precipitate present pure removed salt sample scorify silica silver slag slight excess sodium carbonate solu soluble solution of potassium standard solution steel substance sulphate sulphide sulphuric acid temperature test-lead tested tion titration tube volumetric wash weighed zinc
Popular passages
Page 31 - If a hot bead is touched to a crystal of sodic nitrate an amethystine or rosecolored froth is formed. RF Colorless or with black spots. With Soda. — OF Bluish green and opaque when cold.
Page 313 - Mn,O, = sMnO,. The laws governing chemical interchange have not been fully determined, but the two following exert an important bearing on the results : 1st. When a compound can be formed which is insoluble in the menstruum present, this compound separates as a precipitate. There are exceptions to this rule.
Page 32 - Then, if dissolved in the acid and heated with metallic tin, zinc, or copper, the solutions will be successively blue, green, and brown. If the S. Ph. bead has been treated in RF the solution will become brown.
Page 34 - Coal with Soda. — With its own volume of soda, dissolves with effervescence to a clear bead. With more soda the bead is opaque. With Borax. — Clear and colorless. With S. Ph. — Insoluble. The test made upon a small fragment will usually show a translucent mass of undissolved matter of the shape of the original fragment. When not decomposed by S. Ph., dissolve in borax nearly to saturation, add S. Ph., and re-heat for a moment. The bead will become milky or opaque white.
Page 354 - Al Sb A As Ba Bi B Br Cd Cs Ca C Ce Cl Cr Co Cb Cu Dy...
Page 53 - Ttar mgm- It should be provided with a set of weights from I mgm. to 0.5 gm., and a beam-rider for weighing fractions of a milligramme. It should be kept in a glass case, free from dust, etc., and should be provided with agate knife-edges. The last three balances should be set up on a perfectly firm support, and should be cleaned and adjusted from time to time. The balance should always be tested before weighing, to see if it is in perfect adjustment. The analytical balance should be provided with...
Page 89 - Fuse 1.0 gramme of substance with from one to two sticks of potassium hydrate (the cp caustic potash by alcohol should * School of Mines Quarterly; American Chemical Journal; etc. f School of Mines Quarterly. be used, as any other generally contains sulphur. It should always be tested for sulphur, to be sure that it contains none) in a silver crucible (a crucible lined with gold is preferable, as the alkali generally attacks the silver of the crucible to a slight extent) over a spirit-lamp. The best...
Page 33 - Saturate two orthree borax beads with roasted substance, and treat on coal with a strong RF If a visible button results, separate it from the borax, and treat with S. Ph. in the OF, replacing the S. Ph. when a color is obtained. If no visible button results, add either a small gold button or a few grains of test lead.
Page 26 - With Nitric Acid. — Heat with water and then with dilute acid ; CO, will be set free with effervescence. The escaping gas will render lime-water turbid. With Borax or S. Ph. — After the flux has been fused to a clear bead, the addition of a carbonate will cause effervescence during further fusion. Chlorine, Cl. With S. Ph., saturated with CuO. — Treated at tip of blue flame the bead will be surrounded by an intense azure-blue flame.
Page 271 - If the chemical gets into the horizontal capillary tube, the passage of a little water from the bottle K will remove it, before transferring the gas. When the gas residue is in B, and the fluid in A has been adjusted at the mark C on the horizontal tube, the stopcock G is closed, the bottle K is lowered till the level of water in it and that in the tube B are the same, and the reading is then made.