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.
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.

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.
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.
Is the advice useful?
The electrodes can use thick nails, suitable in size to the vessels.
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.
Search
Is the advice useful?