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19 Of the Composition and general Properties of the Alkalies. --Of Potash. --Manner of preparing it. --Pearlash. --Soap. --Carbonat of Potash. --Chemical Nomenclature. --Solution of Potash. --Of Glass. --Of Nitrat of Potash or Saltpetre. --Effect of Alkalies on Vegetable Colours. --Of Soda. --Of Ammonia or Volatile Alkali. --Muriat of Ammonia. --Ammoniacal Gas. --Composition of Ammonia. --Hartshorn and Sal Volatile. --Combustion of Ammoniacal Gas. CONVERSATION XV. ON EARTHS. 44 Composition of the Earths. --Of their Incombustibility. --Form the Basis of all Minerals. --Their Alkaline Properties. --Silex; its Properties and Uses in the Arts. --Alumine; its Uses in Pottery, &c. --Alkaline Earths. --Barytes. --Lime; its extensive chemical Properties and Uses in the Arts. --Magnesia. --Strontian. CONVERSATION XVI. ON ACIDS. 69 Nomenclature of the Acids. --Of the Classification of Acids. --1st Class --Acids of simple and known Radicals, or Mineral Acids. --2d Class --Acids of double Radicals, or Vegetable Acids. --3d Class --Acids of triple Radicals or Animal Acids. --Of the Decomposition of Acids of the 1st Class by Combustible bodies. CONVERSATION XVII. OF THE SULPHURIC AND PHOSPHORIC ACIDS: OR, THE COMBINATIONS OF OXYGEN WITH SULPHUR AND WITH PHOSPHORUS; AND OF THE SULPHATS AND PHOSPHATS. 80 Of the Sulphuric Acid. --Combustion of Animal or Vegetable Bodies by this Acid. --Method of preparing it. -- The Sulphurous Acid obtained in the Form of Gas. --May be obtained from Sulphuric Acid. --May be reduced to Sulphur. --Is absorbable by Water. --Destroys Vegetable Colours. --Oxyd of Sulphur. --Of Salts in general. --Sulphats. --Sulphat of Potash, or Sal Polychrest. --Cold produced by the melting of Salts. --Sulphat of Soda, or Glauber's Salt. --Heat evolved during the Formation of Salts. --Crystallisation of Salts. --Water of Crystallisation. --Efflorescence and Deliquescence of Salts. --Sulphat of Lime, Gypsum or Plaister of Paris. --Sulphat of Magnesia. --Sulphat of Alumine, or Alum. --Sulphat of Iron. --Of Ink. --Of the Phosphoric and Phosphorous Acids. --Phosphorus obtained from Bones. --Phosphat of Lime. CONVERSATION XVIII. OF THE NITRIC AND CARBONIC ACIDS: OR THE COMBINATION OF OXYGEN WITH NITROGEN
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