A Dictionary of Applied Chemistry by T E. Thorpe

By T E. Thorpe

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C. for other impurities. c. , measured at 15C. This means 100-97/1-72=58-70 litres of acid of 144Tw. c. salt, if the acid be measured at 15C. , the rates of the specific gravities (as per the table quoted above) is as 1-64 and 1-72, and hence the 58-70 litres will FIG. 27 the last charge has been drawn from the latter. For this purpose the damper h (Fig. 22) is raised. The work in the roaster must be carried on in such manner that the batch is thoroughly turned over and mixed. The temperature within the furnace should ultimately be a red heat, and no more vapours should be seen rising from the mass.

White sand 110 Ibs. sodium sulphate 10 Ibs. coal Ibs. coal 4 180 Ibs. white sand 100 Ibs. c. sodium carbonate 3 Ibs. coal described as early as 1520. They were also well acquainted with many of the properties of the resulting solution, such as the coagulation which takes place on adding an acid. Sodium silicates are prepared by fusing together silica and sodium carbonate or by digesting finelydivided silica with caustic soda solution. The composition of the resulting silicate varies with the duration of the heating, the temperature, and the relative amounts of silica and alkali The fused product is broken up by a stonebreaker or ground by suitable machinery and dissolved by long boiling with water, preferably under pressure.

29. ) iodide be kept fused for a considerable time in air, it loses a little iodine. Heated carbon in presence of air it is almost com For the pletely converted into carbonate. is The liquid is then decanted and evaporated evolved. alloAved to the crystallising-point. methyl alcohol at ordinary temperatures, and If sodium is also very soluble in acetone. Avith 19 dioxide Na 2 C0 8 +2S0 2 -fH 2 0=2NaHS0 3 +C0 2 2NaHS0 3 +Na 2 C0 3 =2Na 2 S0 3 +CO 2 . Sodium bisulphite NaHS0 3 is produced by saturating a solution of sodium carbonate Avith sulphur dioxide.

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