Barium perchlorate, decomposition

After the electrolysis has been finished, solid sodium perchlorate may be separated from the solution, but usually other salts of perchloric acid are the final products, which are more suitable for commercial use. Potassium perchlorate is prepared by double decomposition of sodium perchlorate solution with potassium ehloride. If ammonium chloride or sulphate is used for the conversion, ammonium perchlorate will be obtained. Similarly, a mutual reaction with barium chloride will result in barium perchlorate. 

Silver perchlorate, AgC104.—The monoxide dissolves in perchloric acid, forming the perchlorate. It is also produced by double decomposition from barium perchlorate and silver sulphate. The unstable, deliquescent salt melts at 486° C., and decomposes at higher temperatures. 

The mechanism of decomposition of barium perchlorate was examined by Jacobs, Solymosi and Rasko [113]. 

The analysis of the thermal decomposition of inorganic salts and complexes is an important part of the study of catalysts, semiconductors and fine chemicals. The decomposition of barium perchlorate, Ba(C104)2. SHjO was investigated by thermogravimetry and other techniques. The TG curve is shown in Figure 3. 

Fig. 3. Thermal decomposition of barium perchlorate, powder 30 mg, platinum dish, 10°C min , nitrogen, 10 crrf min. ...

If the ratio of the calcium chelate salt to the trihydrated barium salt in a mixture is above 2 1, the thermal decomposition during DTA/TG analysis may be explosive. See other metal perchlorates... 

The nitrates are considerably endothermic in their decomposition and therefore deliver less heat than chlorates or perchlorates, but they can be used with less fear of accidental ignition. Barium nitrate is often selected for white-light mixtures. The barium oxide (BaO) product formed upon reaction is a good, broad-range molecular emitter in the vapor phase (the boiling point of BaO is ca. 2000°C), and condensed particles of BaO found in the cooler parts of the flame are also good emitters of incandescent light. 

SAFETY PROFILE A poison. An unstable material. An oxidizer. When refluxed with an alcohol highly explosive alkyl perchlorates are formed. When heated to decomposition it emits toxic fumes of Cl . A desiccant. See also PERCHLORATES and BARIUM COMPOUNDS. 

The ammonium nitrate which is produced by above reaction is quite hygroscopic. Therefore if a composition which contains ammonium perchlorate comes in contact with another composition which contains potassium nitrate such as black powder, a wet layer of ammonium nitrate occurs between the two compositions and causes misfire. With barium nitrate this double decomposition does not occur, and a mixture of barium nitrate and ammonium perchlorate is allowed in the preparation of firework compositions. 

There may be simultaneous or preliminary dehydration processes for hydrated salts. Group 1 metal perchlorates, as well as calcium, barium and silver perchlorates [59] are represented by reaction (2.13). Aluminium and iron(IIl) perchlorates are represented by reaction (2.14). The solid product of decomposition of magnesium perchlorate is a mixture of magnesium oxide and magnesium chloride. 

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