An industrial chemist reacts a waste sample of solid aluminium turnings with an excess of dilute hydrochloric acid.
Which of the following represents the correct net ionic equation for this reaction, along with the correct physical observations?
2Al(s)+6H+(aq)→2Al3+(aq)+3H2(g)2Al(s) + 6H^+(aq) \rightarrow 2Al^{3+}(aq) + 3H_2(g)2Al(s)+6H+(aq)→2Al3+(aq)+3H2(g) with effervescence and the solid dissolving to form a colourless solution.
Al(s)+3H+(aq)→Al3+(aq)+3H(g)Al(s) + 3H^+(aq) \rightarrow Al^{3+}(aq) + 3H(g)Al(s)+3H+(aq)→Al3+(aq)+3H(g) with a pungent smelling gas and a yellow solution.
Al(s)+2H+(aq)→Al2+(aq)+H2(g)Al(s) + 2H^+(aq) \rightarrow Al^{2+}(aq) + H_2(g)Al(s)+2H+(aq)→Al2+(aq)+H2(g) with effervescence and a green precipitate.
2Al(s)+6H+(aq)+6Cl−(aq)→2AlCl3(aq)+3H2(g)2Al(s) + 6H^+(aq) + 6Cl^-(aq) \rightarrow 2AlCl_3(aq) + 3H_2(g)2Al(s)+6H+(aq)+6Cl−(aq)→2AlCl3(aq)+3H2(g) with the formation of a white precipitate of aluminium chloride.
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