Aluminum can react with water to form aluminum oxide, but the aluminum oxide will prevent the reaction from continuing and the reaction condition is heating.
Aluminum has high metallicity and can react completely with water. However, because it forms an extremely dense oxide film (aluminum trioxide) as soon as it comes into contact with water, the reaction will practically not proceed.
Therefore, aluminum must react with acidic or alkaline water. The function of the acid or alkali is to continuously remove the dense oxide film formed on the surface of the aluminum, allowing the reaction to continue.
Detailed information:
Aluminum and aluminum alloys are currently widely used and are the most used. the most economical materials.
World aluminum production has exceeded copper production since 1956t has always ranked first for non-ferrous metals. The current production and consumption of aluminum (calculated in tons) is second only to steel, becoming the second metal used by humans, and aluminum resources are very abundant. According to preliminary calculations, aluminum mineral reserves represent more than 8% of mineral reserves. materials that make up the earth's crust.
The density of aluminum is very low, but it can be made into various aluminum alloys, such as duralumin, superduralumin, anti-rust aluminum, cast aluminum, etc. These aluminum alloys are widely used in manufacturing industries such as airplanes, automobiles, trains and ships. Additionally, space rockets, space shuttles and artificial satellites also use a large amount of aluminum and its alloys.
CaO+2Al+3H2O=Ca(AlO2)2+3H2 is actually ae reaction step by step, first CaO+H2O=Ca(OH)2 then Ca(OH) 2+ 2Al+2H2O=Ca(AlO2)2+3H2 Please refer to the reaction between NaOH and Al