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[Chemical Knowledge]：What is ammonium bicarbonate?

Read： 505 Time：18months ago Source：Transform the World with Simplicity

Ammonium bicarbonate, also called soda ash, is a common chemical. It has many interesting properties that can be observed and studied through chemical experiments.

ammonium bicarbonate is a water soluble white powder. After exposure to the air for a period of time, it will gradually decompose to produce ammonia and carbon dioxide gas. This reaction is called dissociation reaction, which can be expressed by the following chemical equation:

NH4HCO3 → NH3(g) CO2(g) H2O(l)

In the experiment, we can use ammonium bicarbonate and acetic acid reaction example to observe this reaction. We pour a pinch of ammonium bicarbonate and some acetic acid into a test tube. At this time, the test tube will quickly have bubbles and odor, which indicates that the dissociation reaction has begun.

Then, we can use sodium hydroxide solution to test the production of ammonia gas. Drop ammonia into the test tube, you can see the precipitation of nitrogen, which is a white substance, also called nitrogen-fixing compounds.

through this experiment, we can draw an important property: ammonium bicarbonate can be decomposed to produce ammonia and carbon dioxide gas. This property is widely used in cooking operations such as cooking smoke or scones. When baking Chinese pastries, you need to put some baking soda, which can make the pastry soft and delicious.

In addition, ammonium bicarbonate has an interesting property called an endothermic reaction. This property can be observed experimentally. We put ammonium bicarbonate and ordinary salt in two cups, pour water of the same temperature at the same time, and then measure the temperature of the water with a thermometer. At this time, we will find that the temperature of the water in the ammonium bicarbonate cup will be significantly reduced, while the water temperature in the salt cup will not change.

why? It turns out that when ammonium bicarbonate decomposes, it absorbs heat from its surroundings, causing its environment to become cold. This reaction is also called an exothermic reaction.

sum up, ammonium bicarbonate has two important properties: it can decompose to produce ammonia and carbon dioxide, and it can also cause the temperature of the environment to decrease. These properties can not only be used in experimental research, but also can be applied to life and industry.

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