It melts at 272.4 K and has a boiling point of 423 K (extrapolated). 2) By autoxidation of 2-ethylanthraquinol. The acidic nature of hydrogen peroxide is shown by its neutralization reaction with Hydroxides. Chemical Properties of Hydrogen Peroxide (i) Decomposition: Hydrogen peroxide decomposes to form water and oxygen when exposed to air.This decomposition is exothermic and is acee;erated by heating, addition of alkalis and the introduction of finely divided metals such as platinum, gold and manganese(IV) oxide which acts as a catalyst. 2) To prevent composition of hydrogen peroxide some stabilizer such as urea, glycerine , acetanilide, phosphoric acid must also be added. Electrolysis of cold 50% sulphuric acid using Pt anode, graphite cathode and at high current density produces peroxodisulphuric acid. And hence H, Conc. Ti(SO4)2 + H2O2 + 2H2O ——> H2TiO4 + 2 H2SO4. You have entered an incorrect email address! Required fields are marked *, Calculated amount of sodium peroxide is gradually added to an . hydroperoxides and peroxides. Little hydrogen peroxide is added to initiate the reaction. Structure: 1)Light. The following reactions will give a clear picture: Hydrogen peroxide act as an oxidising agent both in acidic as well as alkaline medium . These crystals are removed ,dried and melted to give pure hydrogen peroxide. 4) When brought in contact with hydrogen peroxide solution ,a filter paper with black stain of PbS turns white. 11) It is used as antichlor in textile industry to remove excess of chlorine after bleaching operations. Pure hydrogen peroxide is very unstable. H2O2 (aq) + 2 OH¯ (aq) ———> 2 H2O(l) + O2 (g) + 2e‾. Now ice cold paste is slowly added to ice cold dilute sulphuric acid by constantly stirring with a glass rod till the final solution remains slightly acidic. Pure hydrogen peroxide turns blue litmus red but its dilute solution is neutral to litmus. 2-ethyl anthraquinol thus produced is oxidized by passing air through the solution to 2-ethyl anthraquinone and hydrogen peroxide. 12) A mixture of hydrazine hydrate and hydrogen peroxide with copper catalyst is used as a rocket propellant. In the above process calculated amount of Na2O2 is used as excess of Na2O2 will react with water to produce NaOH which act as positive catalyst in the decomposition of H2O2. It is kept in paraffin wax-coated glass or plastic or Teflon bottles as rough surface and alkali oxides of glass decompose it. The last trace of water is removed by cooling in a freezing mixture containing dry ice and ether when 100% pure crystalline hydrogen peroxide separates out. Sulphuric acid cannot be used the above process as it oxidises H, Nitric acid cannot be used in the above process as it oxidizes H. The final solution produced in the above reaction is kept slightly acidic as acid acts as a negative catalyst in the decomposition of hydrogen peroxide. Nov 08, 2020 - Hydrogen Peroxide, Its Preparation and Properties Class 11 Notes | EduRev is made by best teachers of Class 11. oxidising character of hydrogen peroxide in acidic medium, oxidising character of hydrogen peroxide in basic medium, reducing character of hydrogen peroxide in acidic medium, reducing character of hydrogen peroxide in basic medium, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. This process is now used for the laboratory preparation of D2O2 i.e. 10 H 2 O separate out and the resulting solution contain about 30% … Further concentration to 99% is done by distillation under reduced pressure. She has started this educational website with the mindset of spreading Free Education to everyone. Insoluble barium sulphate will be precipitated with a transparent liquid above it. At low temperature sodium sulphate separates out as crystalline Glauber’s salt (Na2SO4. It is used to restore the colour of old lead paints. The low boiling H2O2 distils over along with water leaving behind high boiling H2SO4 which is recovered and recycled. Pressure inside the desiccator is reduced by connecting it to a vacuum pump. 6) It is increasingly being used in Environmental chemistry to control pollution by treatment of domestic and industrial effluents ,oxidation of cyanide and restoration of aerobic conditions to sewage waste. Laboratory preparation of hydrogen peroxide: Determination of strength of hydrogen peroxide: Wiley’s Solomons, Fryhle & Snyder Organic Chemistry for JEE (Main & Advanced), Wiley’s J.D. Concentration of hydrogen peroxide by this method is not possible since it tends to decompose. It is example of auto oxidation and auto reduction. Hydrogen peroxide is only a slightly stronger acid than water.Since hydrogen peroxide has two ionizable hydrogen atom, it forms two series of salts i.e. • The melting point of hydrogen peroxide is -0.43 C. The solution of hydrogen peroxide must be handle with care since they may explode with traces of organic matter or even specs of dust. ice-cold solution of 20% H. a) By the action of dilute sulphuric acid: Anhydrous barium peroxide cannot be used since the precipitated BaSO, b) By the action of carbon dioxide or carbonic acid, Peroxodisulphuric acid formed around anode is withdrawn and then distilled with water under reduced pressure.


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