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Ammonium Hydroxide |
| Also known as Aqua Ammonia |
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Uses
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Health
Hazards Haz
Mat Info |
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| Typical aqua ammonia solutions usually contain 20-25% nitrogen because they have vapor pressures less than 5 lb. per square inch gauge at 90 degrees Farenheit. Aqua ammonia solutions with concentrations lower than 22% nitrogen have no vapor pressure at 90 degrees Farenheit; solutions with concentrations of 23% and 24% nitrogen have vapor pressures of 1.6 and 3.2 lb. per square inch, repsectively. | Aqua ammonia solutions can be purchased from manufacturers or produced from anhydrous ammonia. The salt out temperature of aqua ammonia decreases with higher concentrations of anhydrous ammonia. Adding anhydrous ammonia to water produces heat, and concentrations above 16% nitrogen have a vapor pressure at production temperatures, which can cause ammonia loss unless the solution is cooled as it is produced. |
Usually a cooler is used to produce aqua ammonia concentrations above 16% nitrogen to keep the solution temperature below vapor pressure levels. A 20% nitrogen solution can be produced without a cooler by making 16% nitrogen solution, allowing it to cool to ambient air temperature, and then adding more ammonia to increase the analysis to 20% nitrogen.
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