Strontium nitrate decomposition

In the past, dissociation of the nucleoprotein complex has been brought about by salt solutions or by heat denaturation,129 but, more recently, decomposition has been effected by hydrolysis with trypsin,126 or by the use of dodecyl sodium sulfate130 or strontium nitrate.131 Some virus nucleoproteins are decomposed by ethyl alcohol.132 This effect may be similar to that of alcohol on the ribonucleoproteins of mammalian tissues. If minced liver is denatured with alcohol, and the dried tissue powder is extracted with 10% sodium chloride, the ribonucleoproteins are decomposed to give a soluble sodium ribonucleate while the deoxyribonucleoproteins are unaffected.133 On the other hand, extraction with 10 % sodium chloride is not satisfactory unless the proteins have first been denatured with alcohol. Denaturation also serves to inactivate enzymes of the tissues which might otherwise bring about degradation of the nucleic acid during extraction. 

Strontium nitrate, Sr(N03)2, is a high-density material with a melhng point of 843 K. The initial thermal decomposition in the low-temperature region produces Sr(N02)2, which decomposes to SrO in the high-temperature region according to ... 

Because of its higher melting point and less-exothermic decomposition, potassium perchlorate produces mixtures that are less sensitive to heat, friction, and impact than those made withKClO] [2]. Potassium perchlorate can be used to produce colored flames (such as red when combined with strontium nitrate), noise (with aluminum, in "flash and sound" mixtures), and light (in photoflash mixtures with magnesium). 

When a mixture of strontium nitrate and magnesium in a weight ratio of 6 f burns, the strontium nitrate decomposes perfectly owing to the high temperature of the flame and produces little ash. This is quite different from above. The decomposition may be as follows ... 

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. 

Automakers are always investigating alternative reactions for the generation of gas to inflate air bags, in part because the sodium produced in the decomposition of NaN3 (see Problem 5.63) presents safety concerns. One system that has been considered is the oxidation of graphite by strontium nitrate, Sr(N03)2, as shown in the equation below ... 

Strontium oxide is prepared by thermal decomposition of strontium carbonate, hydroxide, or nitrate ... 

Strontium carbonate is almost insoluble in water 0.001 gram per 100 grams of water at 24 C. The solution is alkaline and the pH value was 8.9 at 35 C. If a composition consists mainly of aluminium and nitrates including strontium carbonate, such an alkaline mixture has a risk of spontaneous decomposition in wet state. Strontium carbonate dissolves in water as the bicarbonate, if the water contains COa.. 

A good example of the surprises that one may encounter in the field of new oxidizers is an Italian reference. The double salt Ba(CI0a)2.5Ba(N0a)2.l2H20 is described as extremely stable except for losing water at 60 C and becoming completely dehydrated at 130 C without decomposition. Note that this is a cA/o Yc/nitrate combination. There are no corresponding caldum or strontium compounds, according to the reference. 

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