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General Chemistry

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Moderate

Concept: Redox Half-Reactions

CHEM-6V0BGF

When aluminum foil is placed in concentrated hydrochloric acid, bubbles begin to form and the foil eventually disappears.

What are the two balanced redox half-reactions that describe this process?

A

$6HCl\xrightarrow [ ]{ } \ 6{ H }^{ + }+6{ e }^{ - }$
$6{ e }^{ - } + 2{Al}^{3+}\xrightarrow [ ]{ } \ {Al}_{2}$

B

$2{ H }^{ + }+{ e }^{ - }\xrightarrow [ ]{ } \ {H}_{2}$
$Al \xrightarrow [ ]{ } \ {Al}^{3+}+3{ e }^{ - }$

C

$6{ H }^{ + }+6{ e }^{ - }\xrightarrow [ ]{ } \ 3{H}_{2}$
$2Al \xrightarrow [ ]{ } \ 2{Al}^{3+}+6{ e }^{ - }$

D

$3{H}_{2}\xrightarrow [ ]{ } \ 6{ H }^{ + }+6{ e }^{ - }$
$2{Al}^{3+}+6{ e }^{ - }\xrightarrow [ ]{ } \ 2Al$