Why does hydrochloric acid remove rust??!! PLEASE TEL ME I NEED HELP.?
The experiment is: Place a rusted iron nail in beaker of dilute
hydrochloric acid for a few minutes. Remove the nail from the acid.
/> Observations. Brown rust reacted away exposing grey
iron metal. Bubbling of colourless gas. WHY???? PLease tell me
l really need help!!!!
There are two chemical reactions taking place. First the
Hydrochloric acid reacts with the rust coating the nail
6 HCl (aq) + Fe2O3 (s) --> 2 FeCl3 (aq) + 3 H2O (l)
This exposes the gray Iron metal, which can then react
Fe (s) + 2 HCl (aq) ---> FeCl2 (aq) + H2 (g) It is the Hydrogen gas that you see as bubbles
The reaction is this:
6HCl + Fe2O3 --> 2FeCl3+ 3H2O
There is no more iron (iii) oxide to react when the metal becomes grey and
the reaction will stop. The Fe2O3 would be the limiting reagent.
rust is iron oxide. the hcl combines with the iron oxide
causing the rust to go away and leaving grey metal
it is a reducing agent and since rust is like iron
oxide(oxidizing) it just counters it, i guess that is why Hcl removes
Fe3o2,,,left chemistry a long time back, hopefully this is the answer
Because it combines with the rust making a iron chloride
soluble in water. The gas is Hydrogen!
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