According to the reactivity of metals, aluminum chloride (AlCl3) will not react with copper (Cu). But I am almost sure that the copper nail I put in the aluminum chloride solution became shiny and lost its copper lust. Why did this reaction happen?Well done on noting unexpected observations and following up. Your copper is coated with a dull coating of copper oxide. It became shiny because aluminium salts are acidic in water and the acidity dissolves the coating to form a copper salt and leaving the shiny copper. CuO + 2H3O+ ---- Cu2+ + 3H2O The reaction to form the acidity, a hydrated hydrogen ion H+(H2O) or H3O+ is fairly complex. If aluminium chloride is dissolved in a large amount of water the solution is acidic, but this has nothing to do with formation of hydrochloric acid. The solution contains hydrated aluminium ions and chloride ions: AlCl3(s) + aq → [Al(H2O)6]3+(aq) + 3Cl -(aq) The hexaqua complex ion behaves exactly like ions of similar type formed from transition metals; the small, highly charged metal ion polarises (withdraws electron density from) the water molecules that are attached to the aluminium ion through dative covalent bonds. This makes the hydrogen atoms d+ and susceptible to attack from solvent water, which is acting as a base. The complex ion is deprotonated, causing the solution to be acidic from the formation of hydroxonium ions H3O+: [Al(H2O)6]3+(aq) + H2O(l) → [Al(H2O)5OH]2+(aq) + H3O+(aq)it particularly is authentic that many deodorants, quite those categorized anti-perspirants, incorporate aluminum chloride as an lively ingredient. Aluminum chloride does decrease sweat production via the sweat glands that are placed interior the floor and are quite ample under the hands. For some people who\'re heavy sweaters this drying consequence is amazingly significant. despite the fact that those deodorants decrease sweat production they do no longer block the sweat glands. we are no longer attentive to any at as quickly as risky outcomes on maximum persons from making use of a deodorant containing aluminum chloride. In our very close society at present, physique hygiene and prevention of physique smell are significant. in case you do no longer use a deodorant you are able to discover your persons the two complaining or keeping off you. while you\'re worried with reference to the drying consequence seem for a deodorant that would not incorporate aluminum chloride.Other related question