Thanks to the properties: warm and conductivity, plasticity, the high resilience of corrosion, etc., copper found broad application in economic activity of the person. In the industry it is got from sulphidic and oxide ores, and in laboratory pure copper can be emitted from its oxide.
It is required to you
- - chemical ware;
- - oxide of copper (II);
- - zinc;
- - hydrochloric acid;
- - spirit-lamp;
- - muffle furnace.
Instruction
1. You will be able to restore copper from oxide hydrogen. At first repeat safety measures during the work with heating devices, and also with acids and combustible gases. Write the equations of reactions: - interaction of zinc and hydrochloric Zn acid + 2HCl = ZnCl2 + H2; - copper restoration by CuO hydrogen + H2 = Cu + H2O.
2. Before making experiment, prepare for it the equipment as both reactions have to go in parallel. Take two supports. In one of them fix a clean and dry test tube for copper oxide, and in another - a test tube with an exhaust tube where put several pieces of zinc. Light a spirit-lamp.
3. Fill black powder of copper in the prepared ware. At once fill in zinc with acid. Direct an exhaust tube to oxide. Remember that reaction goes only when heating. Therefore bring a spirit-lamp flame to a test tube bottom with CuO. Try to do everything quickly enough as zinc interacts with acid violently.
4. Still copper can be restored carbon. Work out the reaction equation: 2CuO + C = 2Cu + SO2Vozmite powder of copper (II) also dry it on fire in an open porcelain cup (powder has to be black color). Then fill the received reactant in a porcelain crucible and add fine charcoal (coke) at the rate of 10 parts of CuO to 1 part of coke. Carefully pound everything a pestle. Close leaky a cover that at reaction the formed carbon dioxide disappeared, and place in the muffle furnace with a temperature about 1000 degrees Celsius.
5. After reaction ends, cool a crucible, and fill in contents with water. After that mix the received suspension, and you will see how easy parts of coal are disconnected from heavy reddish balls. Get the received metal. Later, if desired, you can try to alloy in the furnace copper balls among themselves.