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Topic: Acid Base chemistry

when a metal react with acid we get salt and hydrogen . But when metal react with any base  what are the products?

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Re: Acid Base chemistry

Not all, but some of the metals do react with strong base. (Examples: Zinc, aluminium, lead, tin, etc.) Here also hydrogen gas evolves, as that happens in the case of reaction between metal and acid. Reaction with alkali results into formation of oxo-ions like ZnO2(-2), AlO2(-), etc.

Reaction with zinc can be written as:     Zn + 2NaOH = Na2ZnO2 + H2

Reaction with aluminium can be written as:    2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2

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Re: Acid Base chemistry

Thank you sir,
It means that when a metal react with a base, can metal oxidised?
when sodium react with ethyl alcohol we get a hydrogen and sodium ethoxide as a product, is it oxidation of sodium? Please guide me about that reaction.

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Re: Acid Base chemistry

Yes...

In the case of zinc, its oxidation number changes from (0) to (+2) when it reacts with sodium hydroxide. Hence, zinc is oxidised during the formation of zincate ion.

Similar thing happens in the case of sodium when it reacts with ethyl alcohol. Its oxidation number changes from (0) to (+1) during the formation of sodium ethoxide. Hence, sodium is also oxidised during its reaction with ethyl alcohol.

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Re: Acid Base chemistry

Thanks sir