What is the type of the reaction $4 A l + 6 H C l \to 2 A l_{2} C l_{3} + 3 H_{2}$ $4Al + 6HCl -> 2Al_2Cl_3 + 3H_2$ ?

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Answer 1 · 2018-05-27T09:04:31

This is a redox process....note that $A l_{2} C l_{3}$ $Al_2Cl_3$ is a typo...

Aluminum metal is oxidized to aluminum ion...

$A l (s) \to A l^{3 +} + 3 e^{-}$ $Al(s) rarr Al^(3+) +3e^-$ $(i)$ $(i)$

Hydrogen ion is REDUCED to dihydrogen...

$H^{+} + e^{-} \to \frac{1}{2} H_{2} (g)$ $H^+ +e^(-) rarr 1/2H_2(g)$ $(i i)$ $(ii)$

We add $(i) + 3 \times (i i)$ $(i)+3xx(ii)$

$A l (s) + 3 H^{+} + 3 e^{-} \to A l^{3 +} + \frac{3}{2} H_{2} (g) + 3 e^{-}$ $Al(s)+3H^+ +3e^(-) rarr Al^(3+) +3/2H_2(g)+3e^-$

...on cancellation....

$A l (s) + 3 H^{+} \to A l^{3 +} + \frac{3}{2} H_{2} (g)$ $Al(s)+3H^+ rarr Al^(3+) +3/2H_2(g)$

Of course we could add $3 \times C l^{-}$ $3xxCl^-$ to both sides...

$A l (s) + 3 H C l (a q) \to A l C l_{3} (a q) + \frac{3}{2} H_{2} (g)$ $Al(s)+3HCl(aq) rarr AlCl_3(aq) +3/2H_2(g)$

What is the type of the reaction 4Al+6HCl→2Al2Cl3+3H24Al + 6HCl -> 2Al_2Cl_3 + 3H_2?