NaOH + Al + NaNO₂→ NaAlO₂+ NH₃+ H2O 1). What are the Redox reactions of above reaction?    

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llltkl | College Teacher | (Level 3) Valedictorian

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This is a familiar redox reaction, occurring through the intermediacy of hydrogen molecules. As expected, it can be expressed in terms of two ionic half-reactions; one reduction half-reaction and the other oxidation half-reaction.

The reduction half-reaction is: 2NO2⁻ + 7H2 + 12e⁻→ 2NH3 + 4H2O

And the oxidation half-reaction is: Al + 2OH⁻ → AlO2⁻ + H2 + 3e⁻

These two ionic half-reactions add up to give the final ionic reaction.

The reaction can then be balanced easily by cross-multiplying above two half-reactions for electron balance followed by minor adjustments aimed at balancing other atoms.

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lochana2500 | Student, Undergraduate | (Level 1) Valedictorian

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1). 3e⁻+ 2H2O+ Al → AlO2⁻ + 4H⁺ ⇒ ❶

      2e⁻ + 3H⁺+ OH⁻ → H₂+ H2O ⇒ ❷

2). ❶ x 2 + ❷ x 3 ⇒

     H⁺ + 3 OH⁻ + 2Al + H2O →  2AlO2⁻ + 3H₂

     2 OH⁻ + 2Al + 2H2O → 2AlO2⁻ + 3H₂

 

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