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how to balance the following equation NAOH + Al ----- NaAlO2 +H2

how to balance the following equation 
NAOH + Al ----- NaAlO2 +H2
 

Grade:10

1 Answers

Arun
25768 Points
2 years ago
Overall reaction-
2 Al + 2 NaOH → 2 NaAlO2 + H2↑
First you should think why Al would react with a base?..The reason is simple Al is a amphoteric metal which makes it capable to react with both acidic and basic species.Now coming to reaction,Under normal circumstances, aluminum does not react with water, as an impermeable protective layer composed of aluminum hydroxide either forms within seconds or is already in place. With the addition of sodium hydroxide, the formation of a protective layer is prevented. With the production of aluminates (Al(OH)4-), the amphoteric (capable of acting as either an acid or a base) aluminum hydroxide Al(OH)3 goes in solution:
2 Al + 6 H2O ---> 2 Al(OH)3 + 3 H2
Al(OH)3 + NaOH ---> Na+ + [(Al(OH)4-)]
The aluminum completely dissolves.

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