Tip 1: How to get hydrogen peroxide

Hydrogen peroxide - heavy polar bluish liquid with a melting point T˚ (pl.) = - 0,41˚C and the boiling point T˚ (bp.) = 150,2˚C.Liquid peroxide H2O2 has a density of 1.45 g / cm ^ 3.At home and in the laboratory typically use a 30% aqueous solution (perhydrol) or 3% solution of substance.
molecules of H2O2 in the liquid state is strongly associated, thanks to the presence of hydrogen bonds between them.Since hydrogen peroxide can form more hydrogen bonds than water (each a hydrogen atom accounts for more oxygen atoms), its density, viscosity and boiling point, respectively, above.It is mixed with water in all respects, and the net concentrated peroxide and its solutions in the world explode.
At room temperature, H2O2 is catalytically decomposed with the release of atomic oxygen than is due to its use in medicine as a disinfecting agent.Usually take 3% solution of antiseptic.
In industry hydrogen peroxide is produced in reactions with organic compounds, including, for e
xample, by catalytic oxidation of isopropyl alcohol:

(CH3) 2CHOH + O2 = (CH3) 2CO + H2O2.

Acetone (CH3) 2CO - a valuable by-product of this reaction.
also H2O2 is commercially produced by electrolysis of sulfuric acid.During this process, persulfuric acid is formed, which gives the subsequent decomposition peroxide and sulfuric acid.
Laboratory peroxide is generally obtained by the action of dilute sulfuric acid on barium peroxide:

BaO2 + H2SO4 (dil.) = BaSO4 ↓ + H2O2.

insoluble barium sulfate precipitate.
peroxide solution is acidic environment.This is because the H2O2 molecule dissociates according to the type of a weak acid:

H2O2↔H (+) + (HO2) (-).

dissociation constant H2O2 - 1,5 ∙ 10 ^ (- 12).
Showing properties acid, hydrogen peroxide reacts with bases:

H2O2 + Ba (OH) 2 = BaO2 + 2H2O.
peroxides some metals, such as BaO2, Na2O2, can be regarded as salts of hydrogen peroxide - a weak acid.Of these, just to give H2O2 in vitro effect of stronger acids (e.g., sulfuric acid), displacing peroxide.
Hydrogen peroxide can react in three forms: without changing the peroxide group, as a reducing agent or an oxidizing agent.The last type of reactions the most characteristic of H2O2.Examples:

Ba (OH) 2 + H2O2 = BaO2 + 2H2O,

2KMnO4 + 5H2O2 + 3H2SO4 = 2MnSO4 + K2SO4 + 5O2 + 8H2O,

PbS + 4H2O2 = PbSO4 + 4H2O.
Hydrogen peroxide is widely used.Bleaches prepared therefrom introduced into detergents, various organic peroxides;its use in polymerisation reactions, for the restoration of the pictures of lead-based paint and for antiseptics.

Tip 2: How to prepare a solution of hydrogen peroxide

hydrogen peroxide has been widely used in everyday life and medicine.as a disinfectant and an antiseptic, and colorant.In the course of both receiving and using it requires compliance with certain rules.
How to prepare the hydrogen peroxide solution
hydrogen peroxide can be used to treat not only the mechanical damage to the skin - small wounds and cuts.In the past 3 percent solution of the substance used for the treatment of pneumonia, and various viral STI diseases.Prior to the discovery of penicillin peroxide was administered intravenously to people with lung diseases and bronhov.V nowadays feasibility of such an application hydrogen peroxide contested.Some experts agree that this practice has brought positive results, while others argue that hydrogen peroxide for oral administration is not suitable.However, its external application is still ongoing.
To make a 3-percent solution hydrogen peroxide , initially a concentrated solution of its .The easiest way to obtain it in the laboratory - the use of metal oxides on exposure to a dilute sulfuric acid.Thus, for example, barium oxide in cold conditions, connecting with sulfuric acid, forms peroxide hydrogen and salt - barium sulfate: BaO2 + H2SO4 = H2O2 + BaSO4 In industry, sulfuric acid is produced by electrolysis of sulfuric acid, followed by hydrolysis of persulfuric acid:2H2SO4 = H2S2O8 + 2H + + 2e-, H2S2O8 + 2H2O = 2H2SO4 + H2O2 Also hydrogen peroxide obtained by oxidation of isopropanol.It is formed in nature - by the oxidation of various substances with oxygen.Furthermore, in low concentrations it is found in animal cells.
After a concentrated solution hydrogen peroxide , cook out of it 3-percent solution .To do this, take the enamel bowl, pour into it the water tempera- about 50 degrees, then add the hydrogen peroxide the appropriate kolichestve.Perekis hydrogen, in addition to its medical devices are also used in industry.For example, it is used for the bleaching of textiles and paper.Also, it is a good disinfectant in the food industry.Hydrogen peroxide - bleaches, so it has been widely used in cosmetology.