Description
Ammonium bicarbonate, with the chemical formula NH4HCO3, is an inorganic compound. It’s a white, crystalline solid that has a faint ammonia smell.
Key Properties
The most notable property of ammonium bicarbonate is its thermal instability. When heated to temperatures above 36°C (97°F), it breaks down completely into three gaseous products: ammonia (NH3), water (H2O), and carbon dioxide (CO2). This decomposition leaves no solid residue, making it an excellent leavening agent for certain baked goods.
Technical Specifications (Typical Grade)
| Parameter | Specification |
|---|---|
| Purity | 98–99% |
| Moisture | ≤ 0.2% |
| Chlorides (as Cl) | ≤ 0.003% |
| Sulphates | ≤ 0.007% |
| Arsenic | ≤ 0.0002% |
| Heavy metals | ≤ 0.0005% |
Uses
Ammonium bicarbonate is a versatile compound with a variety of applications:
Leavening Agent: Often referred to as baker’s ammonia or hartshorn, it was a precursor to modern baking powder. Its complete decomposition into gases makes it ideal for creating a crisp, light texture in low-moisture items like cookies and crackers. It’s not typically used in moist baked goods because the ammonia gas would get trapped, leaving an unpleasant taste.
Fertilizer: It’s used as a source of nitrogen in agriculture.
Other Industrial Uses: It’s also used in fire extinguishers, as a foaming agent in plastics and rubber, in the production of dyes and pigments, and in leather tanning.
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