Industrial applications for barium include acting as a "getter," or unwanted gas remover. In its elemental form, barium is a soft, silvery-gray metal. 

 

Barium peroxide is the inorganic compound with the formula BaO2. This white solid (gray when impure) is one of the most common inorganic peroxides.

   Physical state at 20 °C :                                                              Liquid.    Odour :                                                                    Strong, vinegar-like    Odour threshold :                                                       No data available.    pH value :                                                                  No data available.    Melting point [°C] :                                                                     16.2 °C    Decomposition point [°C] :                                                               N/A   Critical temperature [°C] :                                                                N/A   Auto-ignition temperature [°C] :                                                 485 °C Flammability (solid, gas) :                                                             N/A Flash point [°C] :                                                                        40°C Boiling point [°C] :                                                         117 - 118 °C Initial boiling point [°C] :                                                         117°C Final boiling point [°C] :                                                         118°C Evaporation rate :                                                                    0,97 Vapour pressure [20°C] :                                     15.2 hPa at 20°C Vapour pressure mm/Hg :                                                         N/A Vapour density :                                                                         2,1 Density [g/cm3] :                                                                   1,049 Relative density, gas (air=1) :                                                  N/A Relative density, liquid (water=1) :                                           N/A Solubility in water [% weight] :                                        Complete Solubility in water :                                                                   N/A Log Pow octanol / water at 20°C :                    No data available. Solubility :                                                                                 2,4 Viscosity at 40°C [mm2/s] :                                                      N/A Explosive properties :                                                             N/A Explosion limits - upper [%] :                                            19,90% Explosion limits - lower [%] :                                                   4% Oxidising properties :                                       No data available.

    We have to remember that the barium peroxide is mainly used to produce hydrogen peroxide by reaction of barium peroxide with sulphuric acid. We can write the chemical equation for this hydrogen peroxide preparation as, BaO2+H2SO4→H2O2+BaSO4. In this above reaction, barium sulphate is recovered as precipitate.We have to remember that the barium peroxide is mainly used to produce hydrogen peroxide by reaction of barium peroxide with sulphuric acid. We can write the chemical equation for this hydrogen peroxide preparation as, BaO2+H2SO4→H2O2+BaSO4 In this above reaction, barium sulphate is recovered as precipitate.

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