RU_KLO
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Ammonium Persulfate decomposition
Hi,
regarding Wiki:
When heated to 120°C, ammonium persulfate decomposes releasing sulfur oxides, nitrogen oxides, oxygen and ammonia.
Could this be used to make ammonia solution? (or the other oxides will interfere)
if yes, should be heated as salt or (saturated) solution? (if heated as salt, could explode?) - from little experience, if salt lands on hot plate it
crackles.
or
Is there a way to make ammonia Solution from ammonium persulfate? (I have a lot of and need some ammonia solution. Better if concentrated)
Thanks
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Bedlasky
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No, it cannot be used this way. Sulfur and nitrogen oxides are all acidic, so you rather get mix of ammonium sulfate, sulfite and nitrate.
For making ammonia generator use some cheap ammonium salt like chloride or sulfate, and sodium hydroxide. You can surely find some procedure here on
forum.
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Alkoholvergiftung
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Why not reakt an ammoniumsalt with an hydroxide? CaOH and dropping an concentrated ammoniumchlorid or sulfat solution on it?
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Mateo_swe
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Or maybe just buy some ammonium solution?
Its available in hardware/paint stores and not especially expensive.
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RU_KLO
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Thanks, I know that buying new reagents is always a solution. but currently the only ammonium salt Ive got is persulfate.... so the idea was to use
available reagents.
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Texium
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That would be a waste of ammonium persulfate. Save it for better things.
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woelen
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Using ammonium persulfate for the sole purpose of making ammonia indeed is not very economical, but if you really want to do so, you can do it by
mixing the salt with a slight excess of solid NaOH and then adding a few drops of water. A lot of gas will be produced, which is a mix of ammonia and
oxygen. Bubble it through water, the ammonia is absorbed, the xoygen passes through.
You'll see a transient very peculiar yellow/orange color when the reaction proceeds. This definitely is caused by the peroxodisulfate reacting with
hydroxide, but this does not affect the final outcome of the reaction. You'll get your ammonia.
Use care with the reaction, it will be quite exothermic. Start with small amounts to get a feeling of it.
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