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Thread: Ammonia and Al

  1. #1 Ammonia and Al 
    Moderator Moderator AlexP's Avatar
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    I reading on a bottle of ammonia not to soak aluminum pans in it. I'd have to guess that some kind of reaction occurs, so what is it? The only thing I can guess is 2NH<sub>3</sub> + 2Al --> 2AlN + 3H<sub>2</sub>...or something like that...


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  3. #2  
    WYSIWYG Moderator marnixR's Avatar
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    i once had this guy standing next to me in chem lab adding aluminium curls to nitric acid which he had forgotten to dilute - the nicest column of brown smoke i've ever seen !

    don't know whether ammonia would work in a similar fashion


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  4. #3  
    Moderator Moderator AlexP's Avatar
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    Quote Originally Posted by marnixR
    i once had this guy standing next to me in chem lab adding aluminium curls to nitric acid which he had forgotten to dilute - the nicest column of brown smoke i've ever seen !

    don't know whether ammonia would work in a similar fashion
    that's cool... thanks for the post.
    "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
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  5. #4  
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    I presume that the "bottle of ammonia" that you refer to was actually ammonia gas (NH<sub>3</sub>) dissolved in water. The resulting solution is then the base ammonium hydroxide (NH<sub>4</sub><sup>+</sup>,OH<sup>-</sup>).

    My guess is that this solution could react with aluminium to form aluminium hydroxide (Al(OH)<sub>3</sub>). So the overall effect could be to damage the finish on aluminium pans.
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  6. #5  
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    Yeah, he's correct. Aluminum reacts with strong basic solutions. That's why you can't use oven cleaners either on aluminum cookware or appliances.
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  7. #6  
    New Member hunterxhunter209's Avatar
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    Because aluminum hydroxide is amphoteric so aluminum can react with basic solution.NH3 solution (NH4OH) is also a basic solution but it's very weak;it disintegrates in normal temperature:NH4OH=NH3+H2O.Although it's weak,it reacts with aluminum according to this chemical equation:
    NH4OH+Al=NH4AlO2+H2(balance it yourself).
    Sorry because of my poor English!
    Although I am stupid and have a brain that cannot study Science,I love Science by all my heart,forever...
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