. The principles of chemistry . p;c., areprecipitated by this means. The salt is then crystallised and ignited: CaNoOg-CaO + 2NOo + 0. In the decomposition of calcium carbonate the lime preserves the form of the lumpssubjected to ignition ; this is one of the signs distinguishing quicklime when it is freshlyburnt and unaltered by air. It attracts moisture from the air and then disinteo^ratesto a powder ; if left long exposed in the air, it also attracts carbonic anhydride andincreases in volume; it does not entirely pass into carbonate, but forms a compound ofthe latter with caustic lime. 606
. The principles of chemistry . p;c., areprecipitated by this means. The salt is then crystallised and ignited: CaNoOg-CaO + 2NOo + 0. In the decomposition of calcium carbonate the lime preserves the form of the lumpssubjected to ignition ; this is one of the signs distinguishing quicklime when it is freshlyburnt and unaltered by air. It attracts moisture from the air and then disinteo^ratesto a powder ; if left long exposed in the air, it also attracts carbonic anhydride andincreases in volume; it does not entirely pass into carbonate, but forms a compound ofthe latter with caustic lime. 606 PRINCIPLES OF CHEMISTRY which is unaffected by heat,^^ and may therefore serve as a fire-resisting material, and was employed by Deville for the constructionof furnaces in which platinum was melted, and silver volatilised by theaction of the heat evolved by the combustion of detonating gas. Thehydrated lime, slaked lime, or calcium hydroxide, (specificgravity 207) is a most common alkaline substance, employed largely Am. Fid. 78.—Continuall3--actiug kiln for burning lime. Tlie lime is charged from above and calcined bj-four lateral gi-ates, R, M. D, fire-bars. B, space for withdrawing the burnt lime. K. stoke-house. M, fire grate. Q, R, under-gi-ate. in building for making mortars or cements, in which case its bind-ing property is mainly due to the absorption of carbonic anhydride.^ ^^ Lime, when raised to a white heat in the vapour of potassium, gives calcium, andin chlorine it gives off oxygen. Sulphur, phosphorus, &:c., when heated with lime, areabsorbed by it. ^ The greater quantity of lime is used in making mortar for binding bricks or stonestogether, in the form of lime or cement, or the so-called slaked li))te. For this purposethe lime is mixed with water and sand, which serves to sejiarate the particles of lime THE VALENCY AND SPECIFIC HEAT OF THE METALS 607 Lime, like other alkalis, acts on many animal and vegetable sub-stances, and for this reason has many p
Size: 1478px × 1690px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublis, booksubjectchemistry
