A Dictionary of Applied Chemistry by T E. Thorpe

By T E. Thorpe

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81437 and 84240 (sodium sulphite is of i ! ' : ; SODIUM. 30 heated with fused sulphur in CO 2 ) ; Verein Ch. Fab. zu Mannheim, D. R. P. 88594 (production of sodium thiosulphate by the action of SO 2 and steam on a mixture of NaHS0 3 and S in presence of water) ; Clemm, D. R. P. 180554 (manufacture of sodium thiosulphate from On steaming the printed cloth alumina is deposited on the fibre by the decomposition of the aluminium thiosulphate, and the material can then be dyed with alizarin, &c. It has been fix aniline greens, and in conjunction with copper to produce the so-called argentine effects which depend upon the deposition of a thin film of copper sulphide on the fibre.

That is, the residue from the 2. Nitre-cake manufacture of nitric acid, consisting of a mixture of a normal and acid sodium sulphate. Nitre-cake is frequently mixed off with an ordinary charge of salt. The free acid deter- mined by analysis replaces part of the sulphuric which would otherwise be required to decompose the salt used. The nitre-cake is broken into lumps which readily melt in the decomposing pan. acid This should be neither 3. Sulphuric acid. too weak nor too strong, preferably about 140 at the that is, strength it usually comes from the Glover tower.

The metasilicate has been obtained in the Only the others forming amorcrystalline condition, phous, glassy bodies. Pure sodium metasilicate is a white, crystalline salt, melting at about 1000 (Kultascheff, Zeitsch. anorg. Chem. 1903, 35, 187). Hydrates containing 5, 6, 7, 8, and 9 mols. of water have been described, but their existence is somewhat doubtful. The aqueous solution of the salt has an alkaline reaction owing to hydrolytic dissociation. Kahlenberg and Lincoln (J. Phys. Chem. 1898, 2, 81) state that at a dilution of 1 grm.

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