Aluminum can react with water.
Based on the reducibility of aluminum, it can be inferred that aluminum can react with water, but experiments have shown that aluminum almost does not react with boiling water . However, aluminum can react significantly with water vapor when heated. conditions, but the reaction does not occur. From the start, it forms a dense oxide film with the oxygen present in the water to prevent the reaction from continuing.
Aluminum is active gold. In dry air, a dense oxide film approximately 50 angstroms (1 angstrom = 0.1 nanometer) thick will immediately form on the surface of the aluminum, preventing the aluminum from further oxidizing and being resistant to oxidation. the water ; but aluminum. The powder is extremely flammable when mixed with air; molten aluminum can react violently with water; aluminum is amphoteric, easily soluble in astrong alkali and can also be dissolved in dilute acid.
Detailed information:
Corundum that exists in nature belongs to α-AlO. Its hardness is second only to diamond, with a high melting point and resistance to acids and alkali. It is often used to make certain bearings, abrasives and refractory materials. For example, the corundum crucible can withstand high temperatures of 1800°C.
AlO has a variety of colors due to different impurities. For example, those containing traces of Cr(III) are rouges and are called rubies; those containing Fe(II), Fe(III) or Ti; (IV) Called sapphire.
Does aluminum metal react with water?
Research on the reaction of aluminum and water
1. Experimental principles
For greater clarity To observe the oxidation of aluminum in air, you can immerse the aluminum part in a mercuric salt solution (mercuric chloride or nitrate solution of mercury)?
3HgCl2+2Al=2AlCl3+3Hg
The mercury generated during the reaction immediately combines with the aluminum to form an aluminum amalgam. Can aluminum, after destroying the oxide film, react with water to displace hydrogen and form a white flocculating aluminum hydroxide precipitate?
2Al+6H2O= 2Al(OH)3↓+3H2↑
2. Experimental method
Method 1:
Use the experiment “oxidation of aluminum with air" to obtain aluminum sheets with "aluminum hairnium”.
Take a test tube, fill it with water and place it upside down in the sink. Use the filter paper to wipe the fluffy “foil hair” on the aluminum foil with the “foil hair” (Note! Cut the “foil hair” into pieces). Do not touch them with your hands), use tweezers to hold the piece of aluminum foil, spread it in the sink and place it under the mouth of the test tube. Can you observe the reaction between the two. aluminum and water?
The gas produced will lower the water level in the test tube. You can use an explosion to test if the gas is hydrogen using the sniffing method?
Method 2:
Reaction of aluminum and water Take a small piece of aluminum foil and put it in a test tube, add 2-3ml water, no reaction is observed, heat with an alcohol lamp, and observe again, still no reactiontion If you add about 0.5 ml of mercuric chloride solution, leave for a while, pour the solution? , and wash the aluminum foil with water 2-3 times, add 2-3ml water. Can aluminum react with water and gas is released if the phenomenon is not obvious, you can heat it slightly?
The reaction between aluminum and water is 2Al+6H2O=2Al (OH)3↓+3H2↑, the reaction condition is heating.
However, experiments have shown that aluminum almost does not react with boiling water, which is why many people think that aluminum does not react with water. In fact, it is the oxygen present in the water that forms a dense oxide film at the start of the reaction, preventing the reaction from continuing.