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Exploring the decomposition of hydrogen peroxide: Why is manganese dioxide a key "assistant"?

English name	hydrogen peroxide
Other names	Hydrogen peroxide, ethoxyethane
Chemical formula	H₂O₂
Molecular weight	34.01
CAS registration number	7722 - 84 - 1
EINECS registration number	231 - 765 - 0
Melting point	-0.43℃
Boiling point	158℃
Water solubility	Miscible
Density	1.13g/mL（20℃）
Appearance	Blue viscous liquid (aqueous solution is usually colorless and transparent liquid)
Application	Surface disinfection, chemical production, odor removal
Safety description	S26，S39，S45，S36/37/39
Hazard symbol	X (harmful), C (corrosive), O (oxidizing)
Hazard description	R22, R41 Dangerous goods
Transport number	UN 2014 5.1/PG 2
Refractive index	1.3350
Storage	Store in a cool place in a plastic bottle with micropores at the mouth
Chemical category	Inorganic - Peroxide
Vapor pressure	1.48mmHg (25℃, 35% aqueous solution)
Toxicity	Low
Acidity	Weak acidity

Reasons for adding manganese dioxide to the decomposition of hydrogen peroxide.

Adding manganese dioxide in the decomposition process of hydrogen peroxide is of great significance. Normally, although hydrogen peroxide decomposes into water and oxygen, the speed is extremely slow. As a catalyst, manganese dioxide can greatly speed up the reaction. Its advantage is that it is highly efficient and its quality and chemical properties remain unchanged before and after the reaction, and it can be reused.

When manganese dioxide is used as a catalyst, the chemical reaction formula is: 2H₂O₂ (MnO₂) = 2H₂O + O₂↑.

This allows hydrogen peroxide to complete the decomposition reaction in a shorter time, and its low economic cost and efficient use convenience make it popular in various experiments and industrial uses.

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