How will you concentrate H2O2 ? Show differences between the structures of H2O2 and H2O by drawing the spatial structures . Also mention three uses of H2O2.

(i) Industrially, H2O2 is prepared by the auto-oxidation of 2-alkylanthraquinols.
2-enthylanthraquinolH2/PdO2/(air)H2O2+Oxidised product
In this case, 1% H2O2 is formed. It is extracted with water and concentrated to ~30% (by mass) by distillation under reduced pressure.
It can be further concentrated to ~85% by careful distillation under low pressure. The remaining water can be frozen out to obtain pure H2O2.
(ii) H2O2 has a non-planar structure.
The molecular dimensions in the gas phase and solid phase are shown below
(a) H2O2 structure in gas phase, dihedral angle is 111.5°
(b) H2O2 structure in solid phase at 110 K, dihedral angle is 90.2°
In the gas phase, H2O is a bent molecule with a bond angle of 104.5° and O-H bond length of 95.7 pm as shown below
(a) The bent structure of water;
(b) The water molecule as a dipole and
(c) The orbital overlap picture in water molecule.
(iii) Following are the three important uses of H2O2
(a) In daily life, it is used as a hair bleach and as a mild disinfectant. As an antiseptic it is sold in the market as perhydrol.
(b) It is used in the synthesis of hydroquinone, tartaric acid and certain food products and pharmaceuticals (cephalosporin) etc.
(c) It is employed in the industries as a bleaching agent for textiles, paper pulp, leather, oils, fats etc.