Detailed steps for experiments on a simple device for producing oxygen from hydrogen peroxide and ma

Experimental utensils: test tubes, long-neck funnels, gas cylinders, glass sheets, sinks, clips, rubber tubes.

Experimental Procedure:1Connecting devices.

2.Check the air tightness. 3. Add manganese dioxide as a catalyst to the test tube, and then add a small amount of water.

Insert the long-neck funnel up to the bottom of the tube and add the appropriate amount of hydrogen peroxide. 4.The gas collection cylinder, which is free of air bubbles, is upside down into the water, and when the air bubbles in the catheter emerge continuously and evenly, the gas collection begins.

5.When gas is not needed, clamp the catheter with a clamp and the liquid will flow back and no more gas will be produced.

Results: Write yourself.

Add 5 ml of 5% hydrogen peroxide solution to the test tube, and put the wooden strip with sparks into the test tube [The wooden strip does not rekindle] Take a small amount of manganese dioxide.

In the test tube, put the wooden strip with sparks at the mouth of the test tube [the wooden strip does not rekindle] Add the manganese dioxide to the hydrogen peroxide solution, and put the wooden strip with the spark at the mouth of the test tube [Wood strip re-ignition] After the test tube no longer produces bubbles, add a small amount of hydrogen peroxide solution, and put the wooden strip with sparks at the mouth of the test tube [Wooden strip re-ignition].

Instruments: Liquid separating funnel, round-bottom flask, iron frame.

Drug: Hydrogen peroxide, mNO2

Step 1Add manganese dioxide to the flask, connect the separating funnel, and fix it to the iron frame.

2 Add hydrogen peroxide dropwise to it and observe the velocity of the bubbles.

Note: A comparative test can be done, i.e., the velocity of the gas can be seen without adding mno2.

Conclusion: mno2

2 H2O2===2H2O+O2 gas.

Reagent bottles, long-neck funnels, glass rods.

Pour the mnO2 into the reagent bottle, moisten the single-hole plug with water, screw the single-hole plug in, insert the funnel into the single-hole stopper, add H2O2 dropwise, and observe the reaction process.

Hydrogen peroxide reacts with manganese dioxide to produce oxygen.

<> oxygen is a kind of elemental element formed by oxygen, the chemical formula O2, its chemical properties are relatively active, and most elements can react with oxygen. It is not very active at room temperature, and it is not easy to interact with many substances. However, it is very active at high temperatures and can be directly combined with a variety of elements, which is related to the electronegativity of oxygen atoms second only to fluorine.

Oxygen is a colorless and odorless gas and is the most common elemental form of oxygen. Melting point, boiling point -183 . Not easily soluble in water, about 30ml of oxygen is dissolved in 1L of water. In the air, oxygen accounts for about 21%. Liquid oxygen is sky blue. Oxygenation is a blue crystal.

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. This method of producing oxygen is also known as adsorption. Small oxygen concentrators using adsorption to produce oxygen have been developed to facilitate home use.

Hydrogen peroxide. It reacts with manganese dioxide to produce oxygen.

Literal expression: hydrogen peroxide, manganese dioxide.

- Water + oxygen.

Method 1 device: gas collection cylinder, catheter, double-hole rubber stopper.

Method 2: Flask, two-hole rubber stopper, catheter, syringe, Note: No alcohol lamp is required

Hydrogen peroxide is in a liquid state, only need to add a catalyst manganese dioxide to react, no need to heat, and can be started and stopped as needed, and the speed of the reaction can be controlled by the droplet acceleration of the hydrogen peroxide solution, and the reaction speed can be judged by the speed of the gas in the flask, and the product is water without pollution.

When hydrogen peroxide is used to produce oxygen, why should the hydrogen peroxide solution in the separating funnel be slowly dropped into the Erlenmeyer flask?

Because the decomposition of hydrogen peroxide will release a large amount of heat, if it is injected into the Erlenmeyer flask quickly, it will cause the temperature to be too high, and the release of a large amount of oxygen will increase the pressure of the system, which will cause the whole system to be in danger of high temperature and pressure.

Manganese dioxide can be used as a catalyst for hydrogen oxide to produce oxygen. h can be used instead of manganese dioxide to do hydrogen oxide solution decomposition reaction.

Summary. Hello, glad for your question.

In the process of our daily chemical experiments, the device for collecting oxygen is called a gas collection cylinder, and the size of the machine bottle is different, which can be determined according to our experiments.

Hope mine is helpful to you, thanks

Hydrogen peroxide and manganese dioxide for oxygen harvesting.

Hello, I'm glad for your question In the process of my daily chemical experiments, the device for collecting oxygen, called the gas collection cylinder, the size of the machine bottle is different, according to our experiment, the disadvantages need to be determined I hope my brother will be helpful, thank you

What is the collection device selected for the laboratory to produce drier oxygen by mixing hydrogen peroxide solution and manganese dioxide?

Gas collection cylinders. Produces drier oxygen.

The oxygen produced can be dried by passing it through concentrated sulfuric acid.

Hydrogen peroxide mess and pants.

It reacts with manganese dioxide to produce oxygen.

1) Erlenmeyer flask, long-necked funnel, gas collection cylinder, sink (2) Closed and extended into the Erlenmeyer flask, the trachea is too cracked and long, the lower end of the long-necked funnel is not immersed below the liquid level (3) First add water to the Erlenmeyer flask, and then immerse one end of the catheter in water, hold the outer wall of the Erlenmeyer flask with both hands, and observe whether there are bubbles coming out of the mouth of the air duct (4) Drain the air bubbles outside the mouth of the gas collection bottle Huiyu (5) Start collecting o 2 without waiting for the bubbles to emerge continuously and evenly; When water is added to the cylinder, bubbles appear under the glass sheet.

1.Excess hydrochloric acid, with mNO2 as the standard for calculation.

The amount of the substance of mno2 is n=m m=

mno2+4hcl=mncl2+h2o+cl2↑1 1

n(cl2)

n(cl2)=

The volume of chlorine is v=n*vm=

2.The solute mass of hydrochloric acid is 200*

The amount of hydrochloric acid is n=mm=73

1 cl2 contains 2 cl

Cl- in solution after the reaction is equal to.

The amount and concentration of chloride ions is c=nv=

(1) a long-necked funnel used for adding liquid drugs in the preparation device; An Erlenmeyer flask as a reaction vessel

So the answer is: long-necked funnel Erlenmeyer flask;

2) manganese dioxide-catalyzed hydrogen peroxide decomposition into water and oxygen; After the reaction is completed, the residue in the Erlenmeyer flask of the reaction vessel is water and water-insoluble manganese dioxide powder, which can be filtered to separate the manganese dioxide in the water

So the answer is: 2H2O2MNO

2H2O+O2, filtered; (3) The laboratory determines the generating device according to the state of the reactants of the gas reaction and the conditions required for the reaction; Depending on the solubility and density of the gas collected, it is decided whether the gas should be collected by draining or by exhausting air upwards or downwards; The air tightness check of the device is to try to create the air pressure difference between the inside and outside of the device

Therefore, the answer is: reactant state and reaction conditions, solubility and density of gas, a section of water column can be formed in the neck of the long-necked funnel (or the liquid level will no longer drop), etc.;

4) The long-necked funnel extends below the liquid level, and the lower port of the funnel is in the liquid, so the gas in the device cannot escape from the long-necked funnel, which we call "liquid seal".

Therefore, the answer is: liquid seal to prevent oxygen leakage;

5) The long-necked funnel can not carry out the gradual dropping of liquid, so it can not control the dropping acceleration of the liquid, if the separating funnel or syringe is used instead of the long-necked funnel, the speed of adding liquid can be controlled

So the answer is: change the long-neck funnel to a separating funnel; Switching the long-neck funnel to a syringe; Switch the long-neck funnel to a rubber-tip dropper; Choose a small cloth bag containing manganese dioxide, pass the wire attached to the small bag through the rubber plug and pump it up and down, or a simple experimental device imitating the principle of Qipu generator (any two of the above schemes are acceptable).

The separating funnel is filled with H2O2

Erlenmeyer flasks contain mno2

Dispensing funnels, round-bottom flasks, catheters, gas collection bottles, water tanks.

All you need is a test tube, and then you can test whether it can be rekindled with a small wooden strip with sparks.