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2Al(s) + 6H2O(l) 2Al(OH)3 (aq) + 3H2 (g) What are the oxidation and reduction half reactions...

2Al(s) + 6H2O(l) 2Al(OH)3 (aq) + 3H2 (g)

What are the oxidation and reduction half reactions under acidic conditions?

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Answer #1

Oxidation half reaction as follows

2Al ----------> Al(OH)3

balance Al

2Al ----------> 2 Al(OH)3 balance O

2Al + 6H2O ----------> 2 Al(OH)3 balance H

2Al + 6H2O ----------> 2 Al(OH)3 + 6H+ balance charge

2Al(aq) + 6H2O(l) ----------> 2 Al(OH)3(aq) + 6H+(aq) + 6e-

Al(aq) + 3H2O(l) ----------> Al(OH)3(aq) + 3H+(aq) + 3e-

reduction half reaction as follows

H2O(l) --------> H2(g) balance O

H2O(l) --------> H2(g) + H2O(l)   balance H

H2O(l) + 2H+ --------> H2(g) + H2O(l)   balance charge

H2O(l) + 2H+ + 2e-   --------> H2(g) + H2O(l)  

2H+ + 2e-   --------> H2(g)

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