Calcium, finely divided metal from

Calcium, finely divided metal from a sodium solution, 6 24 metal powder from a sodium solution, 6 18... 

Perchlorates are powerful oxidizing substances. These compounds explode when mixed with combustible, organic, or other easily oxidizable compounds and subjected to heat or friction. Perchlorates explode violently at ambient temperatures when mixed with mineral acids, finely divided metals, phosphorus, trimethylphosphite, ammonia, or ethylenediamine. Explosions may occur when perchlorates are mixed with sulfur, or hydride of calcium, strontium, or barium and are subjected to impact or ground in a mortar. Perchlorates react with fluorine to form fluorine perchlorate, an unstable gas that explodes spontaneously. Heating perchlorates to about 200°C (392°F) with charcoal or hydrocarbons can produce violent explosions. Metal perchlorates from complexes with many organic solvents, which include benzene, toluene, xylenes, aniline, diozane, pyridine, and acetonitrile. These complexes are unstable and explode when dry. Many metal perchlorates explode spontaneously when recrystaUized from ethanol. Saturated solution of lead perchlorate in mathanol is shock sensitive. 

Almninium, calcium, cobalt, lead, manganese, sodium and zinc abietates ( resinates ), when finely divided are subject to spontaneous heating and ignition. Store in sealed metal containers away from fire hazards. 

The oil-covered reaction mixture is heated on a hot plate to about 110°, and the now fluid metal layer is poured into 200 ml. of mineral oil in a 1-1. beaker. It may be necessary to spoon the melted metal mixture from the reactor if it will not pour readily. The solidified melt, which consists of sodium embedded with 10 to 20% of finely divided calcium, is cut into pieces small enough to fit through a 24/40 standard taper opening, f A pair of tin snips or large scissors makes a convenient tool for cutting sodium. 

---