How to produce oxygen from potassium permanganate and what is the method of oxygen production from p

In the laboratory, potassium permanganate is often heated to produce oxygen. The experimental procedure is:

1) After checking the air tightness, fill the test tube with a small amount of potassium permanganate, put a ball of cotton at the mouth of the test tube, and plug the nozzle with a plug with a catheter. Fix the mouth of the test tube slightly downward and fix it on the iron frame.

2) Fill each of the two gas collection cylinders with water and cover the mouth of the bottle with a glass sheet. Then place the bottle filled with water upside down in the sink with the glass pieces.

3) Heat the tube. Move the alcohol lamp flame back and forth under the test tube to evenly heat the test tube, and then heat the area where the potassium permanganate is located.

4) When air bubbles begin to be released from the catheter mouth, it is not advisable to collect them immediately, and when the air bubbles are released continuously and relatively evenly, then extend the catheter mouth into the gas collection cylinder filled with water. When the water in the bottle is drained, cover the mouth of the bottle with a glass sheet under the surface of the water. Carefully remove the bottle from the sink and place it on the table.

Collect another vial of oxygen in the same way.

5) When the heating is stopped, first remove the catheter from the water and then extinguish the alcohol.

2kmNO4 heats K2mNO4 Mno2 O2

Potassium permanganate can be heated to produce oxygen.

Oxygen production from potassium permanganate is an experiment in junior high school, and the specific method and chemical formula are as follows.

The method is to heat potassium permanganate in a test tube to produce oxygen.

Chemical equation: 2kmNO4 = heating = K2mNO4 + MNO2 + O2.

Potassium permanganate is prone to contact with certain organic matter or easily oxidizing substances**.

The literal expression is potassium permanganate (heated) potassium manganate + manganese dioxide + oxygen.

Potassium permanganate. Decomposition to produce oxygen:

1.Potassium chlorate decomposition: heating a mixture of potassium chlorate and manganese dioxide, using a solid-solid heating device, collected by drainage.

Equation: 2kclo3 = heated mNO2 = 2kCl + 3O2

2.Hydrogen peroxide.

Decomposition: Decomposition of hydrogen peroxide catalyzed by manganese dioxide.

The device adopts a solid-liquid type and is collected by drainage.

Equation: 2H2O2 = MNO2= 2H2O + O2

3.Potassium permanganate decomposition: Solid-solid heating device (same as 1), drainage method collection:

Equation: 2kmNO4 = Heating = K2mNO4 + MNO2 + O2

Supplement: The chemical equation for the production of oxygen from potassium permanganate: 2kmNO4 = heating = K2mNO4 + MNO2 + O2

Potassium permanganate (KMno4, relative molecular weight.

Inorganic compound, dark purple elongated orthorhombic columnar crystals with metallic luster. Orthorhombic crystal system. It was discovered by Westerners in 1659. Chinese common name: gray manganese oxygen.

In the production of chemicals, it is widely used as an oxidant, such as saccharin, vitamin C

oxidants of isoniazid and benzoic acid; used as preservative, disinfectant, deodorant and antidote in medicine; In water purification and wastewater treatment, it is used as a water treatment agent to oxidize hydrogen sulfide.

Phenol, iron, manganese and organic, inorganic and other pollutants to control odor and decolorization; In gas purification, trace sulfur, arsenic, phosphorus, silane, borane and sulfide can be removed; In mining metallurgy, oxidants for the separation of molybdenum from copper, the removal of impurities from zinc and cadmium, and the flotation of compounds; It is also used as a bleaching agent for special fabrics, waxes, greases and resins, an adsorbent for gas masks, and a colorant for wood and copper.

The method of preparing oxygen from potassium permanganate is as follows:

Check: Check the airtightness of the device.

Packing: Loading medicines.

Fix: Fix the test tube to the iron frame.

Point: Light the alcohol lamp to heat it before preheating, note: Be sure to let the test tube be heated evenly, otherwise the test tube will burst due to uneven heat and cold.

Collect: Collect the parabody (drainage method and upward emptying method can be used).

Off: Remove the trachea from the sink (if using the upward emptying method, this step is not necessary, but it is best to remove the catheter and put the slide on the lid first).

OFF: Turn off the alcohol lamp.

Potassium permanganate is used to produce oxygen.

1. The mouth of the test tube is slightly inclined downward: to prevent the condensate from flowing back to the bottom of the test tube and bursting the test tube.

2. The drug is spread at the bottom of the test tube: preheat first, and then the outer flame of the alcohol lamp can be aimed at the part containing the drug for directional heating.

3. The iron clamp is clamped about 1 3 places away from the pipe mouth.

4. The catheter should be slightly exposed with a rubber stopper: it is convenient for gas discharge (approx. .

5. A ball of cotton should be placed at the mouth of the test tube: to prevent potassium rust powder from entering the catheter and blocking the catheter, so that the prepared gas can not be discharged well.

6. When collecting by drainage, collect when the bubbles emerge evenly and continuously (the air in the test tube is discharged at the beginning, and the collected gas is impure at this time).

7. At the end of the experiment, remove the catheter first, and then extinguish the alcohol lamp: to prevent the cold water in the sink from being sucked into the hot test tube and causing the test tube to burst.

8. When collecting gas by upward exhaust method, the conduit extends to the bottom of the gas collection cylinder to exhaust the air. This noisy oak.

1. Assemble the experimental device (the guide tube in the test tube can be slightly extended to facilitate gas export), and check the air tightness of the device.

2. Spread the drug on the bottom of the test tube, and put a small ball of cotton at the mouth of the tube (to prevent the hot oxygen from flowing potassium permanganate.

Powder is blown into the catheter) and the mouth of the test tube is tightly plugged with a single-hole rubber plug with the catheter.

3. Fix the test tube on the iron frame. Raid chain selling.

4. Light an alcohol lamp.

Heat the tube. When heating, the test tube is heated evenly, and then the external flame of the alcohol lamp is heated at the part where the drug is located. ）

5. Start collecting when there are continuous and uniform bubbles released from the catheter orifice.

Before heating, the gas collection cylinder should be filled with water and poured into the sink to wait for collection; Don't collect bubbles at the beginning, otherwise the collected gas will be mixed with air; When there is a large number of air bubbles overflowing from the mouth of the gas collection cylinder, it is full. ）

6. After collecting, move the catheter out of the water.

7. Turn off the alcohol lamp and stop heating.

Potassium permanganate. Oxygen production: 2kmNO4

k2mno4 + mno2 + o2↑

Procedure

Check the airtightness of the device.

Spread the drug flat on the bottom of the tube and tighten the mouth of the tube with a single-hole rubber plug with a catheter (use potassium permanganate to make oxygen, and place a small ball of cotton at the mouth).

Fix the tube on an iron stand.

Light the alcohol lamp and heat the tube after preheating.

Gas collection begins when there are continuous, uniform bubbles coming out of the catheter orifice.

Once collected, remove the catheter from the water.

Turn off the alcohol lamp. Heat potassium permanganate (or potassium chlorate and manganese dioxide.

mixture) to produce oxygen, using the drainage method.

Collect, the operation steps can be summarized as: "check", "load", "set", "point", "receive", "leave" and "extinguish" 7 words. It can be remembered as "tea house fixed-point interest".

Precautions] The drug should be spread flat at the bottom of the test tube and evenly heated.

The mouth of the test tube should be slightly inclined downward to prevent the wet water in the drug from turning into water vapor after being heated, and flowing back to the bottom of the test tube when condensed into water, so that the test tube will burst.

The iron clamp of the iron frame should be clamped in the middle and upper part of the test tube (or 1 3 places away from the test tube mouth).

The catheter in the tube can be slightly extended with a rubber stopper to facilitate gas exit.

Fill the cylinder with water and pour it into the sink (the mouth of the bottle should be below the surface of the water).

When heating, the test tube should be evenly heated first, and then the outer flame of the alcohol lamp should be heated in the part where the drug is located.

When collecting gas by drainage, it should be noted that the bubbles are collected when they are continuously and uniformly discharged, otherwise the collected gas is mixed with air, and when there is a large basin of bubbles coming out of the mouth of the gas collection cylinder, it proves that it is full.

When the heating is stopped, the catheter should be removed from the water and then the alcohol lamp should be removed. If the alcohol lamp is extinguished first, the temperature and pressure of the gas in the test tube will decrease, and the water in the sink will be sucked into the hot test tube, causing the test tube to burst.

When potassium permanganate is used to produce oxygen, a small ball of cotton should be placed at the mouth of the test tube to prevent small particles of potassium permanganate from entering the human catheter during heating.

The gas collector cylinder containing oxygen should be covered with a glass sheet and placed forward, because the density of oxygen is greater than that of air under the same conditions, and the positive discharge can reduce the escape of gas.

1) Drug and its reaction principle: 2kmNO4====K2mNO4 (potassium manganate) + O2+mNO2 2) Experimental device: Drainage method:

Generating device: test tube, alcohol lamp, iron stand with iron clamps. Collection device:

Conduits, gas collection cylinders, sinks. Upward Exhaust Method: Generator:

Test tubes, alcohol lamps, iron stands with iron clips. Collection device: conduit, gas collection cylinder.

a.Precautions: The mouth of the test tube should be slightly inclined downward to prevent the wet water from backing up to the bottom of the tube during the reaction, causing the tube to rupture.

The catheter should not be extended too long into the test tube to facilitate the discharge of oxygen and prevent the drug from clogging the catheter. When using potassium permanganate reactions, a small ball of cotton needs to be placed at the mouth of the test tube to prevent potassium permanganate powder from entering the catheter during heating. The use of potassium chlorate and manganese dioxide is suitable for the preparation of more oxygen, but it should be noted that manganese dioxide must be pure, if the dioxide is mixed with carbon powder, it is easy to occur when producing oxygen**, therefore, it is best to burn when using manganese dioxide.

The drug should be spread flat at the bottom of the test tube and heated evenly. When heating, the test tube should be evenly heated (preheated).The iron clamp is clamped in the middle and upper part of the tube.

Stop the heating and withdraw the catheter first, before withdrawing the alcohol lamp, otherwise the water in the sink will flow backwards, causing the test tube to burst. b.Scope of application:

This device is suitable for the reaction of heating solids to produce gases. (Not suitable for hydrogen peroxide) 3) Collection method: a

The drainage method --- because oxygen is poorly soluble in water. b.The upward exhaust air method --- because oxygen is slightly denser than air.

The air duct should be extended into the bottom of the bottle to exhaust the air as much as possible) 4) Full inspection method: Put the wooden strip with sparks on the mouth of the bottle. If it rekindles, it is full.

5) Full placement: The gas collection bottle filled with oxygen should be covered with the mouth of the slide and placed upward. 6) Operation steps (mainly seven steps):

Formula:"The tea house collects interest at a fixed point" 1.Check:

Check the airtightness of the device. Specifically: first put the catheter into the water, hold the test tube tightly with your hands, and observe whether there are air bubbles released from the catheter mouth, if it is released, it means that the device does not leak.

Principle: Hold it in your hand, the temperature in the test tube is high, the gas pressure is strong, the gas volume is large, if there is no air leakage, the gas is discharged from the catheter orifice, and bubbles are seen. 2.

Packing: Loading medicines. Plug the tube tightly with a single-hole rubber stopper3

Fixed: Fix the test tube on the iron frame. 4.

Point: Light an alcohol lamp and heat evenly. 5.

Receiving: Collecting gas. 6.

Leave: Allow the catheter to evacuate the sink first. 7.

OFF: Turn off the alcohol lamp.

Heating potassium permanganate to produce oxygen step.

Potassium permanganate is used in the laboratory to produce oxygen.

This is the chemical reaction formula (i.e., the principle).

The chemical equation for potassium permanganate to oxygen is represented by a two-wire bridge and the relationship between electron transfer is as follows:

The literal expression of potassium permanganate to produce oxygen is: potassium permanganate one (heating) potassium manganate + manganese dioxide + oxygen. As one of the strongest oxidants, potassium permanganate is affected by pH and has the strongest oxidation ability in acidic solutions.

Its corresponding acids, permanganic acid and anhydride, are strong oxidants, which can automatically decompose and heat, and cause combustion in contact with organic matter.

Chemical equation for potassium permanganate to oxygen :

2kmno = k mno +mno +o In the experiment of producing oxygen from potassium permanganate, it is necessary to heat for a period of time to collect oxygen (mainly due to the activation energy), so it is essential to "heat" this reaction condition when writing the equation.

1. Assemble the experimental device (the catheter in the test tube can be slightly extended to facilitate gas export) and check the air tightness of the device.

2. Spread the drug on the bottom of the test tube, put a small ball of cotton at the nozzle (to prevent the hot oxygen flow from blowing potassium permanganate powder into the catheter), and plug the test tube mouth tightly with a single-hole rubber plug with the catheter.

3. Fix the test tube on the iron frame.

4. Light the alcohol lamp and heat the test tube. (When heating, the test tube should be heated evenly, and then the outer flame of the alcohol lamp should be heated at the part where the drug socks are located.) ）

5. Start collecting when there are continuous and uniform bubbles released from the catheter orifice. (Before heating, the gas collection cylinder should be filled with water and poured into the sink to wait for the collection of the message; Don't collect bubbles at the beginning, otherwise the collected gas will be mixed with air; When there is a large number of air bubbles overflowing from the mouth of the gas collection cylinder, it is full. ）

6. After collecting, move the catheter out of the water.

7. Turn off the alcohol lamp and stop heating.