Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . chemists,prefer test-solutions of pure soda. With test-solutionscontaining caustic alkalies, exact neutralisation of an acidis not only more easily effected, but more readily per-ceived, particularly when either solution is tinted withlitmus. 3 Prepared by grad
Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . chemists,prefer test-solutions of pure soda. With test-solutionscontaining caustic alkalies, exact neutralisation of an acidis not only more easily effected, but more readily per-ceived, particularly when either solution is tinted withlitmus. 3 Prepared by gradually heating the pure crystallisedcarbonate to redness. From being uniform in composition,and easily procured or prepared, they are much employed;preference being usually given to the soda-salt. * The crystals must be free from attached water, butnot the least effloresced. 30 ACIDIMETRY Fahr.). and kept there, with occasional agita-tion, until the renewed evolution of gas hascompletely ceased. The little wax stopper isthen taken off the tube (a), the apparatust aken out of the hot water, wiped dry, andsuction applied, by means of a perforated cork,or a small india-rubber tube, and the mouth,to the end of the tube (d), until the sucked airno longer tastes of carbonic acid. The wholeis then allowed to become quite cold, when it5. (J) A wide-mouthed flask, capable ot holding 2i} to8 oz., containing sample for trial (/). (B) Ditto, capable of holding 1^ to 2 oz., partly filledwitli oil of vitriol (g). (a, c, d) Tubes fitting air-tight in the flasks by meansof the corks (J) and {j). (b) Piece of wax fitting air-tight on the end of a. (e) Small tube capable of holding about 1 drachm ofpowdered bicarbonate of soda or potash. (k) Open end of the tube (d). (k) Silk cord fastened to the tube (e). is replaced in the balance (the other scale stillcontaining the original weights), and weightsadded to restore the equilibrium. The loss of weight represents the exactquantity of dry carbonic a
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