Lead chlorate, decomposition

For example, the dye. Solvent Yellow 14 has a sublimation temperature of about 125 °C whereas its melting point is 134 °C. The reaction temperature of the chlorate-lactose composition is in excess of 500 °C, which often results in chemical reactions bringing about the destruction of a large proportion of the dye. For example, strong reduction brings about cleavage as shown in Scheme 10.2, whereas pyrolysis leads to decomposition as in Scheme 10.3 Hence, a typical orange smoke composition contains up to 50% of dyestuff in order to offset losses due to the above reactions. 

Lead Chlorate Pb(Cl03)2 Thermal decomposition may be explosive.7... 

The decomposition reaction of potassium chlorate is rare among the common oxidizers because it is exothermic, with a heat of reaction value of approximately -10.5 kcal/mole [ 2]. While most other oxidizers require a net heat input for their decomposition, potassium chlorate dissociates into KCl and O2 with the liberation of heat. This heat output can lead to rate acceleration, and allows the ignition of potassium chlorate-containing compositions with a minimum of external energy input (ignition stimulus). 

Another important factor is the thermal stability and heat of decomposition of the oxidizer. Potassium chlorate mixtures tend to be much more sensitive to ignition than potassium nitrate compositions, due to the exothermic nature of the decomposition of KCIO 3. Mixtures containing very stable oxidizers - such as ferric oxide (Fe 2O 3) and lead chromate (PbCrO 4) - can be quite difficult to ignite, and a more-sensitive composition frequently has to be used in conjunction with these materials to effect ignition. 

A mixture of 150 parts of oxalic acid, 40 of potassium chlorate, and 20 of water is heated to 60°, and the soln. cone, in vacuo at 50° until it begins to crystallize. The cold liquid i3 then treated with 3 volumes of absolute alcohol, when potassium carbonate is precipitated. Fine deliquescent needles of potassium chlorite can be obtained by fractional crystallization in vacuo. The residue gives a further crop of crystals of the chlorite by treatment with 95 per cent, alcohol. Small yellow crystals of silver or lead chlorites can be obtained by double decomposition. 

The chlorates, like the nitrates, are all readily soluble in water lead and silver chlorites, like the corresponding nitrites, are sparingly soluble salts and lead perchlorate is the only salt which does not easily dissolve. As already mentioned, chloric acid is readily decomposed when its aqueous solution is warmed chlorous acid is still less stable but perchloric acid, which may be prepared by distilling together potassium perchlorate with concentrated sulphuric acid, is relatively stable, seeing that it can be distilled without decomposition. It is an oily liquid, with acid taste it is apt to explode when brought into contact... 

Oxygen may also be obtaiued by heating the chlorates of other metals, notably barium,1 calcium,2 strontium,3 lead,4 and silver,5 or by decomposition of metallic bromates and iodates.6... 

Other experimental reproductive effects. A skin and severe eye irritant. A narcotic. Human mutation data reported. A common air contaminant. Highly flammable liquid. NCxmres of 30-60% of the vapor in air ignite above 100°. It can react violently with acid anhydrides, alcohols, ketones, phenols, NH3, HCN, H2S, halogens, P, isocyanates, strong alkalies, and amines. Reactions with cobalt chloride, mercury(II) chlorate, or mercury(II) perchlorate form violendy in the presence of traces of metals or acids. Reaction with oxygen may lead to detonation. When heated to decomposition it emits acrid smoke and fumes. 

Decomposition of mixtures of hypochlorite and hypobromite leads to formation of both chlorate and bromate . The unravelling of the rate expressions and mechanism will require development of more selective analytical procedures than those used so far, although rate coefficients and tentative mechanisms have been reported. 

Bowden and Singh [37, 38] achieved explosion of lead and silver azides when crystals were irradiated with an electron beam of 75 kV and 200 pA. Explosion was partly due to heating of the crystals by the electron beam. To substantiate this, crystals of potassium chlorate with a melting point of 334°C readily melted in the beam, showing a temperature rise close to the explosion temperature of the azides. Sawkill [97] investigated with an electron microscope the effect of an electron beam on lead and silver azides. If explosion did not take place, color changes and nucleation occurred cracks developed within the crystals which broke up into blocks about 10 cm across and were believed to be associated with a substructure in the crystals. In silver azide the progression to silver was pronounced but did not follow the thermal decomposition route. 

AMMONIUM PHOSPHATE or sec-AMMONIUM PHOSPHATE or AMMONIUM PHOSPHATE, DIBASIC or AMMONIUM PHOSPHATE, MONOBASIC (7783-28-0, dibasic 7722-76-1,monobasic) HgN04P (monobasic) H9N2O4P (dibasic) Noncombustible solid. Contact with air slowly forms anhydrous ammonia. Contact with caustics forms anhydrous ammonia gas. Violent reaction with strong oxidizers, potassium chlorate sodium hypochlorite strong bases. Reacts with antimony(V) pentafluoride lead diacetate magnesium, silver nitrate zinc acetate. Heat of decomposition produces toxic fiimes of ammonia and phosphorus oxides. 

BARIUM SULFIDE (21109-95-5) BaS Flammable solid. Oxidizes in dry air. Contact with acid, acid fumes, moisture, steam, or moist air causes decomposition with the formation of toxic and flammable hydrogen sulfide gas. Evolved gas can form explosive mixtures with air and may cause spontaneous ignition or explosion. Violent reaction with strong oxidizers, calcium chlorate calcium nitrate chlorine dioxide phosphorus(V) oxide strontium chlorate strontium nitrate. Incompatible with lead dioxide, potassium chlorate, potassium nitrite may explode at elevated temperatures. On small fires, use smothering quantities of dry chemical powder, dry clay, dry groimd limestone (CaCOj), dry soda ash,dry sand or approved Class D extinguishers, do not use water, foam, or hydrous agents. 

LEAD SULFOCYANATE (592-87-0) Pb(CNS)2 Thermally sensitive decomposes at 374°F/190°C. Violent reaction with strong reducing agents strong oxidizers, nitric acid peroxides, nitrates. Incompatible with strong oxidizers, strong acids, chlorates, finely divided metals potassiiun iodate. Thermal decomposition may release lead fumes, carbon oxides, nitrogen oxides, and sulfur dioxide gas. 

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