Ammonium bicarbonate, with the CAS number 1066 - 33 - 7, is a white crystalline powder. It has a slight ammonia odor. The chemical formula of ammonium bicarbonate is NH₄HCO₃. Its molar mass is approximately 79.06 g/mol. It is soluble in water, but insoluble in ethanol and acetone. The density of ammonium bicarbonate is about 1.586 g/cm³. It decomposes when heated to release ammonia, carbon dioxide, and water vapor. This decomposition property is one of its important characteristics and is widely used in various industries.
1. **Food Industry**: Ammonium bicarbonate is commonly used as a food additive, specifically as a leavening agent. When added to baked goods such as cookies, crackers, and some types of bread, it decomposes during the baking process, releasing gases that cause the dough to rise and become porous. This results in a light - textured and crispy product.
2. **Agriculture**: It can be used as a nitrogen fertilizer. The ammonium ions in ammonium bicarbonate provide a source of nitrogen for plants, which is essential for their growth and development. It is relatively inexpensive and can be easily applied to the soil.
3. **Chemical Industry**: It is used in the production of pharmaceuticals, pigments, and other chemical products. It can also be used as a buffer in some chemical reactions.
**In the Food Industry**:
- When using ammonium bicarbonate as a leavening agent in baking, it should be added to the dry ingredients (such as flour) and mixed well before adding the liquid ingredients. The recommended dosage is usually 1 - 3% of the flour weight. For example, if you are using 500 grams of flour, you can add 5 - 15 grams of ammonium bicarbonate.
- It is important to note that ammonium bicarbonate should be used in a well - ventilated area during the baking process because of the ammonia gas released.
**In Agriculture**:
- Ammonium bicarbonate can be applied directly to the soil. It should be evenly spread on the soil surface and then plowed or mixed into the soil to a depth of about 10 - 15 cm to prevent the loss of ammonia gas. The application rate depends on the soil fertility and the type of crops. Generally, for cereal crops, the application rate is about 20 - 30 kg per acre.
**In the Chemical Industry**:
- The usage of ammonium bicarbonate in chemical reactions varies depending on the specific reaction requirements. It is usually added to the reaction system in a controlled manner, and the reaction conditions such as temperature, pressure, and reaction time need to be carefully controlled.
**Bakery Case**: A small - scale bakery was experiencing problems with the texture of their cookies. The cookies were coming out too dense and lacked the desired crispiness. After consulting with a food technologist, they decided to use ammonium bicarbonate as a leavening agent. They added 2% ammonium bicarbonate based on the flour weight to their cookie recipe. After baking, the cookies had a light and crispy texture. The customers' feedback was very positive, and the bakery saw an increase in sales of their cookies.
**Agriculture Case**: A farmer in a rural area had a wheat field with relatively low soil fertility. He decided to use ammonium bicarbonate as a nitrogen fertilizer. He applied 25 kg of ammonium bicarbonate per acre to the wheat field at the tillering stage. After a few weeks, the wheat plants showed better growth and development. The yield of the wheat increased by about 15% compared to the previous year, which was a significant improvement for the farmer.
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