Saturday, August 13, 2011 at 12:36PM
Drew Wolfe

Hydrogen Peroxide, H2O2

"When it's pure, hydrogen peroxide is an almost colourless (very pale blue) substance that resembles water (and mixes with it in all proportions). It freezes at -0.41°C and boils at 150.2°C (extrapolated to 760 mm pressure). Its density is 1.44 g cm-3 in the liquid state at 25°C and 1.64 g cm-3 in the solid state at -4.5°C, so that, unlike ice, solid H2O2 sinks when placed in the corresponding liquid form. It has a skewed structure with a dihedral angle of 111.5° (gas phase), which minimises repulsion between the lone pairs and the O-H bond pairs. The dihedral angle is affected by hydrogen bonding; it is 90.2° in solid H2O2."

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