Osmium tetroxide also osmium viii oxide is the substance characterized by the formula oso4. The substance is remarkable for its various functionalities despite the uniqueness which showcases, Of osmium an assortment of intriguing features, One of which is that the substance is sturdy volatile. The compound but most, Is colourless samples appear yellow. This is most likely because of the existence within the impurity oso2, Which is yellow, Brown in colour. Osmium viii oxide forms monoclinic crystals. It includes a characteristic acrid chlorine, Like odor. Theelement name osmium is derived from osme, Greek for odor. Oso4 is volatile it sublimes when kept at a normal temperature It dissolves easily across an extensive selection of organic solvents. You will find it to be also moderately Capable of being dissolved in aqueous solutions, With which it reacts reversibly to form osmic acid see below . Pure osmium viii oxide is probably colourless featuring served as suggested that its yellow hue is due to osmium dioxide oso2 impurities. The osmium tetroxide molecule is tetrahedral and therefore non, Polar. This nonpolarity helps oso4 penetrate charged cell membranes. Oso4 is 518 times more soluble in carbon tetrachloride than in water.