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Osmium Tetraoxide
Osmium tetroxide (also osmium(VIII) oxide) is the chemical compound with the Chemical formula, formula OsO4. The compound is noteworthy for its many uses, despite its toxicity and the rarity of osmium. It also has a number of unusual properties, one being that the solid is Volatility (chemistry), volatile. The compound is colourless, but most samples appear yellow. This is most likely due to the presence of the impurity Osmium dioxide, OsO2, which is yellow-brown in colour. In biology, its property of binding to lipids has made it a widely-used stain in electron microscopy. Physical properties Osmium(VIII) oxide forms monoclinic crystals. It has a characteristic acrid chlorine-like odor. The chemical element, element name osmium is derived from ''osme'', Greek language, Greek for ''odor''. OsO4 is volatile: it sublimation (chemistry), sublimes at room temperature. It is soluble in a wide range of organic solvents. It is also moderately soluble in water, with which it reacts re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonium Hydroxide
Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH3(aq). Although the name ammonium hydroxide suggests an alkali with composition , it is actually impossible to isolate samples of NH4OH. The ions and OH− do not account for a significant fraction of the total amount of ammonia except in extremely dilute solutions. Basicity of ammonia in water In aqueous solution, ammonia deprotonates a small fraction of the water to give ammonium and hydroxide according to the following equilibrium: : NH3 + H2O NH4+ + OH−. In a 1 M ammonia solution, about 0.42% of the ammonia is converted to ammonium, equivalent to pH = 11.63 because H4+ = 0.0042 M, H− = 0.0042 M, H3 = 0.9958 M, and pH = 14 + log10 H− = 11.62. The base ionization constant is : ''K''b = H4+OH−] / H3= 1.77. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
