I need help with the chemical reaction of Al + NaOH?

2020-09-11 1:16 pm

Okay, so I've been everywhere online trying to find an answer to this question, and I'm really hoping I can find it here. In the Chemical reaction of Al + NaOH, why is the product "NaAlO2" instead of using the double replacement rule and being Na + AlOH?

If that explanation was to stupid, I'm asking why the reaction is like this,
2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H.

Instead of
Al+ NaOH → AlOH + Na (To tired to write in the mole ratios, been up all night trying to figure this out)

Also I'm really looking to learn how and why products can have have 3 elements in a row like "NaAlO" and also where I can learn to predict the products of chemical reactions with 3 reactants if anyone has information or a youtube video as to where I could learn this or if you could just explain it to me It would be greatly appreciated.

回答 (1)

micatkie

2020-09-11 1:46 pm

✔ 最佳答案

Reactive metals can react with strong acids to give hydrogen gas. However, some metals, such as aluminum, can also react with strong alkalis (strong bases) to give hydrogen gas. Such metals are sometimes known as amphoteric metals. The word equation is:
amphoteric metal + strong base → salt + hydrogen

The equation for the reaction between aluminum and sodium hydroxide is written as:
2Al + 2NaOH → 2NaAlO₂ + H₂

The displacement reaction between Al and NaOH cannot occur.
Al + 3NaOH → Al(OH)₃ + 3Na …… (cannot occur)
This is because Al is less reactive than Na, and a less reactive metal cannot displace a more reactive metal.

NaAlO₂ is not a special compound. It is a salt containing Na⁺ and AlO₂⁻, similar to common salts such as NaNO₃ and CaCO₃.

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