[Jewelry making - Article 00047] - Re: [Orchid] How do I netrulise Nitric Acid solution

[John Burgess]

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>      I have some Nitric Acid that has been in storage for several years
>     .  I used it for coloring Silica Bronze. I want to get rid of it but
>     I think I should Netrulize the solution first. Any safe procedure
>     you suggest will be apreciated verry much. 


    G'day Billy Bates;  The first thing to do is to dilute the
    concentrated acid down to about 10 - 15%.  As you have already some
    experience with the acid, you will know the need to wear rubber gloves
    and eye protection. and perhaps a plastic or rubber apron. Pour the
    acid slowly into water with constant stirring; it will get warm, but
    nothing like as hot as the dilution of sulphuric acid gets.    When
    cool, add sodium carbonate (washing soda) or sodium bicarbonate
    (baking powder) slowly, with stirring until it no longer fizzes, which
    indicates that the acid is neutralised.   What you have now is a
    solution of sodium nitrate which is often used as a fertilizer.  You
    can absorb it into dry soil, mixing well, and spread it thinly over a
    pasture, or even a vegetable plot, or take the dried soil/nitrate mix
    to the local tip and scatter it about there.   Do not, however absorb
    it into organic materials like sawdust; it would make the sawdust far
    more flammable when dried, as all nitrates are powerful oxidising
    agents.   Nitrates are one of the main ingredients of gunpowder and
    fireworks. -- Cheers now, John Burgess;   johnb AT ts.co.nz of Mapua
    Nelson NZ  

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