+Minkie+ said:Its been awhile since I was doing redox reactions, but I'm presuming the reaction took place in the presence of water. If so the Aluminium Nitrate should undergoe a redox reaction with the water.
Half equations:
2H2O(l) -> O2(aq) + 4H+(aq) + 4e-
Al3+(aq) + 3e- -> Al(aq)
Full equation:
6H2O(l) + 4Al3+(aq) -> 2Al2O3(s) + 4H+(aq)
The Aluminium and Water react due to their electronegativity.
In this conditions should precipitate Al(OH)3 (white) which easily include impurities; infact this precipitation it's used to purify water. A small, not initially visible amount of coloured substance (chromate, for example) easily gives a colour to the precipitate.mavsqueen06 said:i did have a reaction with chromate too, but i had another with clear sodium carbonate and aluminum nitrate and got an orange ppt. I was thinking it could be Al2O3? i just don't know how that could occur.
The chemical formula for aluminum's reaction with hydrochloric acid is Al + HCl → AlCl3 + H2.
Aluminum reacts with water by producing aluminum oxide and hydrogen gas. The chemical formula for this reaction is 2Al + 6H2O → 2Al(OH)3 + 3H2.
When aluminum reacts with sodium hydroxide, it produces aluminum hydroxide and hydrogen gas. The chemical formula for this reaction is 2Al + 2NaOH + 6H2O → 2Na[Al(OH)4] + 3H2.
The reaction between aluminum and nitric acid is different because it produces nitrogen dioxide gas instead of hydrogen gas. The chemical formula for this reaction is 2Al + 6HNO3 → 2Al(NO3)3 + 3NO2 + 3H2O.
Some common reagents used in reactions with aluminum include hydrochloric acid, sodium hydroxide, nitric acid, and sulfuric acid. Other reagents may also be used, depending on the desired reaction and end product.