You will need
- plastic bottles of 1.5 liters, a rubber ball, pot of water, potassium hydroxide or sodium hydroxide (caustic soda, sodium hydroxide), 40 cm wire of aluminium, a piece of zinc, a glass container with a narrow neck, hydrochloric acid, rubber bulb, 12 Volt battery, wire, copper, wire, zinc, glass jar, water, salt, glue, syringe.
Fill halfway with water plastic bottle. Throw in a bottle and dissolve in water 10-15 grams of sodium hydroxide or caustic soda. Put the bottle in a pot of water. Aluminum cut wire pieces at 5 inches in length, and throw it in the bottle. Put on the neck of the bottle a rubber ball. Released during the reaction of the aluminum with the alkali solution, the hydrogen will be collected in the rubber balloon. This reaction takes place with violent evolution of heat - be careful!
Pour into a glass container of hydrochloric acid, and throw it in her zinc. Put on the neck of a glass container with a balloon. Released during the reaction of zinc with hydrochloric acid hydrogen will be collected in a balloon.
Pour into a glass container of water and stir in 4-5 tablespoons of salt. Then push the syringe against the piston copper wire. Seal this place with glue. Lower the syringe into the vessel with the brine and pushing the plunger, fill the syringe. Connect the copper wire to the negative terminal of the battery. Down next to the syringe in saline solution zinc wire and connect it to the positive terminal of the battery. The reaction of the electrolysis of copper wire about hydrogen, which displaces the syringe from the saline solution, the contact of the copper wire with the brine interrupted, and the reaction will stop.
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;
- - DC generator.
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.
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
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.
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.
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.
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.
Keep in mind that according to the reaction equation of hydrogen will be collected two times more oxygen.
The electrodes can use thick nails, suitable in size to the vessels.