How can I balance this chemical equations? Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas.

##color(blue)(2″Al”(s) + 6″HCl”(aq) -> 3″H”_2(g) + 2″AlCl”_3(aq))##

This reaction is between a metal and an acid which typically results in a salt and the release of hydrogen gas. The unbalanced reaction is

##Al + HCl -> H_2 + AlCl_3##.

This is a redox reaction, whose half-reactions are and become:

##2(“Al”(s) -> “Al”^(3+)(aq) + cancel(3e^(-)))##
##3(2″H”^(+)(aq) + cancel(2e^(-)) -> “H”_2(g))##
##2″Al”(s) + 6″H”^(+)(aq) -> 3″H”_2(g) + 2″Al”^(3+)(aq)##

Aluminum oxidizes as ##”Al” -> “Al”^(3+)##, while hydrogen reduces as ##2″H”^(+) -> “H”_2^0##.

If we add back the spectator ##”Cl”^(-)##, we get:

##color(blue)(2″Al”(s) + 6″HCl”(aq) -> 3″H”_2(g) + 2″AlCl”_3(aq))##

I hope this was helpful.

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