What is the equation for the chemical reaction of producing oxygen in the laboratory?

1.Heating potassium permanganate, the chemical formula is: 2kmNO4===( )K2mNO4+MNO2+O2

2.Potassium chlorate was heated with catalyst MNO2 with the chemical formula: 2kClO3===( , mNO2) 2kCl+3O2

3.Hydrogen peroxide (hydrogen peroxide) in the catalyst MNO2 (or red brick powder, potato, cement, rust, etc.), to produce O2 and H2O, the chemical formula is: 2H2O2===(Mno2) 2H2O+O2

Although there are three equations for producing oxygen in the laboratory, the current textbooks tend to decompose hydrogen peroxide, because this reaction does not need to be heated and easy to operate, it is easy to control the occurrence and stop of the reaction, manganese dioxide is good, and the rate is fast. 2h2o2===(mno2) 2h2o+o2↑

2H2O2 *****= 2H2O+O2 (mnO2 manganese dioxide).

2kmNO4===K2mNO4 + MNO2 + O2 (heating).

2kclo3*****=2kCl+3O2 (mnO2 manganese dioxide, and to be heated).

There are generally three ways to produce oxygen in the laboratory.

1) Heat potassium chlorate and manganese dioxide with the chemical equation of 2kclo3 mno2△＝2kcl+3o2↑．

2) Potassium permanganate, the chemical equation is: 2kmNO4 K2MNO4+MNO2+O2

3) Hydrogen peroxide and manganese dioxide, the chemical equation is: 2H2O2 Mno2 2H2O+O2

Oxygen produced in the laboratory is commonly obtained as follows.

1. Heat potassium permanganate.

2kmNO4 = = K2mNO4 + MNO2 + O2 2, use catalyst Mno2 and heat potassium chlorate.

2kCl = (mNO) = 2kCl + 3O 3, catalyze hydrogen peroxide with catalyst Mno2.

2h₂o₂=(mno₂)=2h₂o+o₂↑

The decomposition reaction equations are:

Water decomposes under the action of direct current [2H2O== energized ==2H2 +O2] Phenomenon: Air bubbles are generated on the electrode, v(h2):v(o2)=2:

1. The gas (O2) produced by the positive electrode can rekindle the wooden strip with sparks, and the gas (H2) produced by the negative electrode can burn in the air to produce a light blue flame.

Heating basic copper carbonate [Cu2(OH)2CO3== ==2CuO+CO2 +H2O] Phenomenon: The green powder turns black, the inner wall of the test tube is formed with water mist or water droplets, and the clarified lime water becomes turbid.

Heating potassium chlorate and manganese dioxide to produce oxygen: [2kclo3==mno2 catalyzed and ==2kcl+3o2] Phenomenon: There are bubbles generated, and the wooden strips with sparks are re-ignited.

Heating potassium permanganate to oxygen: [2kmNO4== ==K2mNO4+mNO2+O2] Phenomenon: There are bubbles generated, and the wooden strips with sparks are re-ignited.

Hydrogen peroxide for oxygen production in the laboratory: [2H2O2==Mno2 catalysis or ==O2 +2H2O] Phenomenon: There are bubbles generated, and the wooden strips with sparks are rekindled.

Heating mercury oxide: [2hgo== ==2hg+o2] Phenomenon: red turns silvery-white, and the wooden strip with sparks rekindles.

Carbonic acid is unstable and decomposes: [H2CO3====CO2 +H2O] Phenomenon: There are bubbles generated, and the litmus test solution turns from red to purple.

Oxygen is produced in the laboratory, usually with potassium permanganate, potassium chlorate, hydrogen peroxide, and the chemical equations of the reaction are:

1.Heating potassium permanganate, the chemical formula is: 2kmNO4===( )K2mNO4+MNO2+O2

2.Potassium chlorate was heated with catalyst MNO2 with the chemical formula: 2kClO3===( , mNO2) 2kCl+3O2

3.Hydrogen peroxide (hydrogen peroxide) in the catalyst MNO2 (or red brick powder, potato, cement, rust, etc.), to produce O2 and H2O, the chemical formula is: 2H2O2===(Mno2) 2H2O+O2

The equation for taking oxygen in the laboratory is 2kmno ==k mno +mno +o. The experiment first checks the air tightness, and the test tube tilting means that when installing the large test tube, the test tube should be slightly tilted, that is, the test tube mouth should be lower than the bottom of the test tube, so as to prevent the small amount of water contained in the drug from turning into water vapor when heating, and condensing into water droplets at the nozzle and backflowing, resulting in the rupture of the test tube.

Pressurized at low temperatures, the air is transformed into a liquid state, and then evaporated, because the boiling point of liquid nitrogen is 196, which is lower than the boiling point of liquid oxygen (183), so the nitrogen first evaporates from the liquid air beat, and the rest is mainly liquid oxygen.

The process of producing oxygen

Taking advantage of the fact that nitrogen molecules are larger than oxygen molecules, special molecular sieves are used to separate oxygen from the air. First of all, the compressor is used to force the dry air to enter the adsorber of the vacuum through the molecular sieve, the nitrogen molecules in the air are adsorbed by the molecular sieve, and the oxygen enters the adsorbber, and when the oxygen in the adsorber reaches a certain amount (the pressure reaches a certain level), the oxygen valve can be opened to release the oxygen.

After a period of time, the nitrogen adsorbed by the molecular sieve gradually increases, the adsorption capacity is weakened, and the purity of the oxygen produced decreases.