Which is the best method for the preparation of h2o2 in laboratory?
Answers
by acidification of berium peroxide
Answer:
Best method for the preparation of H₂ O₂ in laboratory are from sodium peroxide and preparation from barium peroxide
1. Preparation of H₂ O₂from sodium peroxide:
Sodium peroxide in small amount is added to cold water gives hydrogen peroxide and sodium hydroxide.
Na₂O₂ + 2 H ₂ O ➡ H₂ O₂+ 2 NaOH
In place of cold water cold dilute sulfuric acid is also used.
the reaction is given as
Na₂O₂ + H₂SO₄ ➡ H₂ O₂ + Na₂SO₄
the sodium sulphate formed can be removed on cooling as crystals of Na
2.Preparation of H₂O₂ from barium peroxide: thin paste of barium peroxide made with water is acidified with aqueous sulfuric acid gives hydrogen peroxide and barium sulphate ( forms precipitation) and by eliminating excess amount of water by evaporation under reduced pressure.
the reaction is given as
BaO₂ . 8H₂ O + H₂SO₄ ➡ BaSO₄ + H₂O₂ + 8 H₂O