Saltpeter: Difference between revisions
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'''Potassium nitrate''', also known as '''saltpeter''', is a chemical compound with the chemical formula KNO<sub>3</sub>. It is an ionic salt of potassium ions K<sup>+</sup> and nitrate ions NO<sub>3</sub><sup>−</sup>, and is therefore an alkali metal nitrate. It is a source of [[nitrogen]] and | [[File:Potassium nitrate structure.svg|thumb|2D structure of saltpeter.]] | ||
[[File:Dusičnan draselný.PNG|thumb|Potassium nitrate sample]] | |||
[[File:Niter from Tarapaca, Chile.jpg|thumb|a piece of niter collected in Tarapaca, Chile]] | |||
'''Potassium nitrate''', also known as '''saltpeter''', is a [[Chemical compounds|chemical compound]] with the chemical formula KNO<sub>3</sub>. It is an ionic salt of potassium ions K<sup>+</sup> and nitrate ions NO<sub>3</sub><sup>−</sup>, and is therefore an alkali metal nitrate. It is a source of [[nitrogen]] and it occurs in nature as a mineral, niter. | |||
== Production == | |||
=== Mineral Sources === | |||
Saltpeter minerals can be found in collected mineral deposits, and purified into usable saltpeter | |||
=== Potassium Hydroxide & Ammonium Nitrate === | |||
=== Potassium Hydroxide & Nitric Acid === | |||
[[Lye|Potassium hydroxide]] or [[Potash|potassium carbonate]] can be used to neutralize [[nitric acid]], producing aqueous potassium nitrate in the reactions shown below. Be sure to perform the reactions slowly and/or with temperature control, as they are highly exothermic. | |||
KOH + HNO<sub>3</sub> → KNO<sub>3</sub> + H<sub>2</sub>O | |||
K<sub>2</sub>CO<sub>3</sub> + 2 HNO<sub>3</sub> → 2 KNO<sub>3</sub> + H<sub>2</sub>O + CO<sub>2</sub> | |||
=== Bacterial Oxidation === | |||
Certain strains of aerobic bacteria are capable of oxidizing some nitrogen-containing molecules to nitrates. [[Urea]] (found in urine) and [[ammonia]] are common biological sources of oxidizable nitrogen. Historically, potassium nitrate was produced on scale in [[Niter bed|niter beds]] by using naturally occurring bacteria to oxidize nitrogen-rich animal waste into nitrates which were then recovered through [[solvent extraction]] and [[recrystallization]] with water and hardwood [[Wood ash|ash]]. Bacterial oxidation is the primary mechanism which forms natural deposits. | |||
=== Bat Guano === | |||
Bat guano is often rich in nitrates due to the bat's diet and bacterial oxidation. Nitrate can be extracted from bat guano in a similar manner to niter bed material. | |||
== Uses == | |||
Major uses of potassium nitrate are in [[fertilizer]]s, tree stump removal, rocket propellants and fireworks, and it is one of the major components of [[Black powder|gunpowder]]. | Major uses of potassium nitrate are in [[fertilizer]]s, tree stump removal, rocket propellants and fireworks, and it is one of the major components of [[Black powder|gunpowder]]. | ||
== Dependencies == | |||
* [[Potassium]] | |||
* [[Nitrogen]] | |||
* [[Oxygen]] | |||
** '''Potassium nitrate''' | |||
*** [[Gunpowder]] | |||
== See also == | == See also == | ||
* [[Fertilizer]] | * [[Fertilizer]] | ||
* [[ | * [[Chemical compounds]] | ||
== References == | == References == | ||
{{wa|Potassium_nitrate}} | {{wa|Potassium_nitrate}} | ||
{{wa|Niter}} | |||
[[Category:Chemical compounds]] | [[Category:Chemical compounds]] | ||
[[Category:Stubs]] | [[Category:Stubs]] | ||
Latest revision as of 21:50, 17 May 2025
Potassium nitrate, also known as saltpeter, is a chemical compound with the chemical formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It is a source of nitrogen and it occurs in nature as a mineral, niter.
Production
Mineral Sources
Saltpeter minerals can be found in collected mineral deposits, and purified into usable saltpeter
Potassium Hydroxide & Ammonium Nitrate
Potassium Hydroxide & Nitric Acid
Potassium hydroxide or potassium carbonate can be used to neutralize nitric acid, producing aqueous potassium nitrate in the reactions shown below. Be sure to perform the reactions slowly and/or with temperature control, as they are highly exothermic.
KOH + HNO3 → KNO3 + H2O
K2CO3 + 2 HNO3 → 2 KNO3 + H2O + CO2
Bacterial Oxidation
Certain strains of aerobic bacteria are capable of oxidizing some nitrogen-containing molecules to nitrates. Urea (found in urine) and ammonia are common biological sources of oxidizable nitrogen. Historically, potassium nitrate was produced on scale in niter beds by using naturally occurring bacteria to oxidize nitrogen-rich animal waste into nitrates which were then recovered through solvent extraction and recrystallization with water and hardwood ash. Bacterial oxidation is the primary mechanism which forms natural deposits.
Bat Guano
Bat guano is often rich in nitrates due to the bat's diet and bacterial oxidation. Nitrate can be extracted from bat guano in a similar manner to niter bed material.
Uses
Major uses of potassium nitrate are in fertilizers, tree stump removal, rocket propellants and fireworks, and it is one of the major components of gunpowder.
Dependencies
See also
References
| This article uses material from the Wikipedia article Potassium_nitrate, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). | 
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| This article uses material from the Wikipedia article Niter, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). |
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