Al + nano3 + naoh = na2alo2 + nh3 + h2o

     

How does ammonia evolve here? Is it that we get hydrogen gas evolving in the reaction between Al and NaOH, and this gas reacts with the NO3 anion?

I there a logical way khổng lồ deduce this, or should one just memorize that "Al & Zn reduce $ceNO3-$ to lớn ammonia in basic solutions"?

P.S.

I learned that the reaction is called "a nitrate kiểm tra using Devarda"s alloy", but there is no specific mô tả tìm kiếm of the process in Wikipedia. All I learned is that the reason is certainly not the freshly-minted hydrogen:

Nascent hydrogen was supposed khổng lồ be responsible for the reduction of arsenate or nitrate in arsine or ammonia respectively. Nowadays, isotopic evidence<8> has closed the nascent hydrogen debate, presently considered to be a Gedanken artifact of romanticism.

And I wonder why NaOH is needed. Probably to lớn activate the aluminium (to break the oxide layer).




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edited Nov 10, 2021 at 0:37
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orthocresol
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