Advice 1: How to get out of the water oxygen

Oxygen can be extracted from many chemical compounds. For industrial purposes, oxygen is often produced by air liquefaction with simultaneous cleaning. But oxygen can get in and out of the water. However, in the home or in the school laboratory it may turn out quite a bit. For this you need to split a water molecule into atoms of oxygen and hydrogen.
How to get out of the water oxygen
You will need
  • water;
  • -sulfuric acid;
  • -source DC voltage of 6-12 V;
  • galvanic Bank (rectangular glass vessel with a volume of 5-8 liters);
  • -carbon electrodes of electric batteries;
  • - 2 clear plastic cups;
  • -bitumen;
  • the tube from a dropper;
  • -vial;
  • -glass jar;
  • -soldering iron;
  • -2 wires.
Instruction
1
Take a plastic Cup. Make a well in the bottom hole and insert the electrode so that it is positioned coal inside the glass. The junction of the electrode and glass, isolate the bitumen from the bottom. Similarly, treat the glass to the second electrode. The metal part of each electrode solder the wire. It is better to take wires of different colors, e.g., red and blue.
2
In a plating bath fill with water about 2/3 of the height. Add 1-2 ml of diluted sulfuric acid. Concentration is not very important because sulfuric acid is only needed for polarization of water.
3
Install the cups with the electrodes so that the electrodes were immersed in the water, and the amount of air between the water surface and the bottom of the Cup possible was minimal. Connect the electrodes to the terminals of the current source. For example, connect the red wire to the anode, and the blue to the cathode. Through the transparent walls of the galvanic bath and glasses watch near the electrodes start to form bubbles, which rise upward and accumulate in the glasses. The following reaction occurs: 2 H2O→2H2+O2. At the cathode (negative electrode) accumulate hydrogen, and around the anode — oxygen molecules.
4
Using the tube from a dropper, you can take one or the other gas in a jar with water and fill with it the vial for analysis. For example, oxygen can burn red-hot red-hot metal wire. Hydrogen also burns itself out. We must remember that in the course of the experiment it is necessary to avoid mixing of the gases and mixing of hydrogen with air.
5
The amount of oxygen obtained in this experiment are small, because it actively interacts with the carbon electrode and is absorbed by them, in addition generate carbon dioxide as an impurity. To receive more oxygen you will need an inert anode. This anode can be made of a plate of platinum or of metal plate and covered it with a layer of gold or palladium.
Note
As current source you can use a car battery.

Don't forget that the process produces not only oxygen but also hydrogen. He is in the presence of contaminants becomes explosive.
Useful advice
For this experiment, it is better to take distilled water. In a pinch, you can use boiled. Water from the tap is not suitable, since it often contains chlorine. In addition, when using water from the tap on the electrodes may form a scum.

Advice 2: How to release oxygen from water

Pure oxygen in large quantities is used in medicine, industry and other fields. For these purposes it is obtained from air by liquefaction of the latter. In the laboratory the gas can be obtained from the oxygenostergade compounds, including water.
How to release oxygen from water
You will need
  • - clean the tubes;
  • electrodes;
  • - DC generator.
Instruction
1
Before beginning the experiment, repeat safety. Strictly observe the rules of work with electrical appliances. Also, remember that the produced gases are flammable and explosive, therefore, require careful handling.
2
Repeat the concept of electrolysis. Remember that the cathode (negatively charged electrode) will undergo the process of electrochemical reduction. Consequently, there will be collected hydrogen. And at the anode (positively charged electrode) - the process of electrochemical oxidation. There would be atoms of oxygen. Write down the reaction equation: 2H2O → 2H2+О2Катод: 2H + 2e = H2 │2Анод: 2O – 4e = O2 │1
3
Prepare two electrodes. You can get them from copper or iron plates with a length of 10 cm and a width of about 2 cm Attach to them conductors of electric current.
4
Then in the pot, pour water and lower back electrodes. As a vessel for electrolysis use a deep mold or glass thick-walled, extending up.
5
Then take two clean test tubes and pour back the water. Close them with corks. Later open these vessels under water in electrolyzer and immediately put on the electrodes. Do this carefully so the water from the test tubes are not spilled. This is necessary in order to prevent air and in the process of electrolysis were clean gases.
6
Connect the DC generator. Turn it on when you know it's prepared correctly. Under the action of electric current on the electrodes will begin bubbling gases. Gradually the oxygen and hydrogen will fill the tubes, displacing the water.
Note
Keep in mind that according to the reaction equation of hydrogen will be collected two times more oxygen.
Useful advice
The electrodes can use thick nails, suitable in size to the vessels.

Advice 3: How to get oxygen

The value of oxygen cannot be overemphasized. Entering into the cells and oxidizing the organic matter, the release of oxygen provides the necessary energy for life. To ensure a comfortable human life, the content of oxygen in the air should be about 21%, which is not always true. So, residents of cities are forced to breathe air containing less than half the norm. At least to improve the atmosphere of your home, you can use simple ways of getting oxygen in the home.
How to get oxygen
You will need
  • * 0.5 l of water;
  • * wide non-metal bowl;
  • * 2 tablets gidroperita;
  • * crystals of potassium permanganate;
  • * potassium (sodium) nitrate;
  • * spoon for heating.
Instruction
1
The most affordable way is: put a bowl of water on the table and dissolve it in tablets gidroperita. To accelerate the process in advance they can be crushed.
2
Once gidroperit is completely dissolved, throw a few crystals of potassium permanganate, and stir. The liquid will hiss and begin to foam, these phenomena are accompanied by the secretion of oxygen.
3
Termination of hiss, accordingly, will mean the end of the reaction. To resume you have to add one component: the fluid is brown, add the peroxide, and if the color upon termination of the hiss has not changed - a couple of crystals of potassium permanganate.
Over a bowl, you can get some or just put her in her room and enjoy the easier breathing.
4
In order to get oxygen, you can also take potassium (sodium) nitrate (sold in shops for gardeners) and heat it in a spoon. In this case, the oxygen will be allocated in the heating process.
Note
* overdo the inhalation of oxygen is not necessary, as this can lead to oxygen toxicity.
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