Why does the rust come off the iron (word equation would be nice), and what gas are the bubbles made of?Chemistry: Why does rust on an iron nail disappear and bubbles form when placed in dilute hydrochloric acid?
Hydrochloric acid will dissolve the rust first and the iron nail underneath.
The rust disolves to form iron [III] chloride and water
The nail starts dissolving to form iron[II] chloride and bubbles of hydrogen.
Some people on this site still seem not to use the modern international [IUPAC] names so iron [III] chloride is ferric chloride and iron[II] chloride is ferrous chloride.Chemistry: Why does rust on an iron nail disappear and bubbles form when placed in dilute hydrochloric acid?
Fe oxidises to Fe2O3. When dilute HCl is added to the iron nail, the chemical reaction (on the basis of electrochemical reactivity) takes place:-
Iron Oxide + HCl + water ---%26gt; IronChloride + Hydrogen + water
removing off the rust so that FeCl3 is formed
ad Bubbles of Hydrogen gas removed.
iron oxide(Fe2O3.xH2O) converts into ferric chloride and hydrogen gas is evolved
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