Hydrogen peroxide physical properties and preparation
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ANSWER:-
●Physical properties of Hydrogen Peroxide:-
a》In pure state hydrogen peroxide is almost colorless (very pale blue) liquid.
b》It melts at 272.4 K and has a boiling point of 423 K (extrapolated).
c》It is miscible in water in all proportions and forms hydrates.
● Preparation of Hydrogen Peroxide:
1.》From sodium peroxide (Merck’s method)
Calculated amount of sodium peroxide (Na2O2) is gradually added to an ice-cold solution of 20% H2SO4 in small lots with constant stiring.
Na2O2 + H2SO4 → Na2SO4 + H2O2
Upon cooling, crystals of Na2SO4.10H2O separate out and the resulting solution contains about 30% H2O2. The solution also contains some dissolved Na2SO4, but it does not interfere with the reactions of H2O2. A pure sample of H2O2 may, however, be prepared by vacuum distillation.
2.》From barium peroxide-Laboratory method of preparation.
Hydrogen peroxide is prepared from barium peroxide by the following methods:
(a)》 By the action of dilute sulphuric acid. Apaste of hydrated barium peroxide (BaO2.8H2O) is prepared in ice – cold water and then added slowly to an ice-cold solution of 20% H2SO4.
BaO2.8H2O + H2SO4 → BaSO4 + H2O2 + 8H2O
The white precipitate of BaSO4 is removed by filtration leaving behind a dilute solution (5%) of H2O2. In this method, anhydrous barium peroxide can not used since the precipitated BaSO4 forms a protective layer around unreacted barium peroxide thereby preventing the further reaction.Here H2SO4 also acts as a catalyst for decomposition of H2O2.
(b)》By the action of carbon dioxide or carbonic acid. When a rapid stream of CO2 is bubbled through a thin paste of BaO2 in ice-cold water, H2O2 and BaCO3 are produced:
The insoluble barium carbonate is removed by filtration leaving behind a dilute solution of H2O2
(c)》By the action of phosphoric acid. Hydrogen peroxide can also be prepared by the action of phosphoric acid on barium peroxide:
This method has the advantage over
method since almost all the heavy metal (e.g. Pb etc) impurities present in BaO2 and which catalyse the decomposition of H2O2 are removed as insoluble phosphates. As a result, the resulting solution of H2O2 has good keeping properties.
you can write any one or any 2
《[{<(in short:-
Hydrogen peroxide is prepared from barium peroxide by the following methods: (a) By the action of dilute sulphuric acid. Apaste of hydrated barium peroxide (BaO2.8H2O) is prepared in ice – cold water and then added slowly to an ice-cold solution of 20% H2SO4.>}]》
mark my answer as brainlist answer☺.
ANSWER:-
●Physical properties of Hydrogen Peroxide:-
a》In pure state hydrogen peroxide is almost colorless (very pale blue) liquid.
b》It melts at 272.4 K and has a boiling point of 423 K (extrapolated).
c》It is miscible in water in all proportions and forms hydrates.
● Preparation of Hydrogen Peroxide:
1.》From sodium peroxide (Merck’s method)
Calculated amount of sodium peroxide (Na2O2) is gradually added to an ice-cold solution of 20% H2SO4 in small lots with constant stiring.
Na2O2 + H2SO4 → Na2SO4 + H2O2
Upon cooling, crystals of Na2SO4.10H2O separate out and the resulting solution contains about 30% H2O2. The solution also contains some dissolved Na2SO4, but it does not interfere with the reactions of H2O2. A pure sample of H2O2 may, however, be prepared by vacuum distillation.
2.》From barium peroxide-Laboratory method of preparation.
Hydrogen peroxide is prepared from barium peroxide by the following methods:
(a)》 By the action of dilute sulphuric acid. Apaste of hydrated barium peroxide (BaO2.8H2O) is prepared in ice – cold water and then added slowly to an ice-cold solution of 20% H2SO4.
BaO2.8H2O + H2SO4 → BaSO4 + H2O2 + 8H2O
The white precipitate of BaSO4 is removed by filtration leaving behind a dilute solution (5%) of H2O2. In this method, anhydrous barium peroxide can not used since the precipitated BaSO4 forms a protective layer around unreacted barium peroxide thereby preventing the further reaction.Here H2SO4 also acts as a catalyst for decomposition of H2O2.
(b)》By the action of carbon dioxide or carbonic acid. When a rapid stream of CO2 is bubbled through a thin paste of BaO2 in ice-cold water, H2O2 and BaCO3 are produced:
The insoluble barium carbonate is removed by filtration leaving behind a dilute solution of H2O2
(c)》By the action of phosphoric acid. Hydrogen peroxide can also be prepared by the action of phosphoric acid on barium peroxide:
This method has the advantage over
method since almost all the heavy metal (e.g. Pb etc) impurities present in BaO2 and which catalyse the decomposition of H2O2 are removed as insoluble phosphates. As a result, the resulting solution of H2O2 has good keeping properties.
you can write any one or any 2
《[{<(in short:-
Hydrogen peroxide is prepared from barium peroxide by the following methods: (a) By the action of dilute sulphuric acid. Apaste of hydrated barium peroxide (BaO2.8H2O) is prepared in ice – cold water and then added slowly to an ice-cold solution of 20% H2SO4.>}]》
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dwipendukundu210:
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you can also read the sort not
of the preparation of Hydrogen Peroxide
at the bottom of the answer
but sorry for this large information
but it is benefited for you bro
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