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Ammonium carbonate

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Ammonium carbonate is a chemical compound with the formula (NH4)2CO3. It is an ammonium salt of carbonic acid. This substance exists as a white powder or a hard, translucent block. It is a strong electrolyte, meaning it can conduct electricity well in a solution. The material has a molar mass of 96.09 g/mol and a density of 1.50 g/cm3.

Because of its unique properties, it serves many different roles in science and industry.

The way this compound reacts to heat is very important. This process is known as heat activation. When ammonium carbonate is heated, it undergoes thermal decomposition. This means it breaks down into different substances. It specifically degrades into three things: carbon dioxide, ammonia, and water.

The carbon dioxide gas is the most useful part for bakers. It creates tiny bubbles within dough or batter. These bubbles expand as they heat up, which causes the food to rise.

Ammonium carbonate can also break down slowly even without much heat. At standard temperature and pressure, it follows two different pathways of decomposition. One pathway involves the compound spontaneously turning into ammonium bicarbonate and ammonia. This ammonium bicarbonate then breaks down further into carbon dioxide, water, and another molecule of ammonia. Because of these constant changes, a pure sample will eventually become a mixture of various byproducts.

In the kitchen, this substance is often called baker's ammonia. It has a long history as a leavening agent, which is something that makes dough rise. In the past, it was known as salt of hartshorn. This name came from the fact that it was originally made from ground deer horn. It was also referred to as sal volatile. It served as the predecessor to the modern baking powder we use today.

It is still used in traditional recipes from Scandinavia and northern Europe. These recipes include items like Speculoos, Lebkuchen, Tunnbröd, and Amerikaner.

Bakers must use ammonium carbonate carefully to get the best results. It is best suited for making thin, dry baked goods like crackers or cookies. In these thin items, the ammonia gas can escape easily during the baking process. This prevents a strong smell from remaining in the food. However, it should not be used for moist items like cake. Ammonia is hydrophilic, which means it is attracted to water. In a moist cake, the ammonia may stay trapped and leave a bitter taste.

Beyond the kitchen, ammonium carbonate has many specialized uses. It is a main component in smelling salts, though these are not produced on a large commercial scale. In Canada, Buckley's cough syrup uses it as an active ingredient to help with bronchitis symptoms. It is also used as an emetic, which is a substance used to induce vomiting. You can even find it in smokeless tobacco products.

In science and industry, the compound plays several technical roles. It can be used as an acidity regulator, and it is identified by the E number E503. In photography, an aqueous solution of the compound works as a cleaning agent for lenses. It even has a role in agriculture. In Washington State, it is used as bait for apple maggots. This helps scientists monitor infestations and manage the Apple Maggot Quarantine Area.

As of 1997, about 80,000 tons of ammonium carbonate were produced every year.

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