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Ammonium perchlorate

physical science Maturity 11-13 Next article →

Ammonium perchlorate is a very important chemical. It is a white or colorless solid. This solid can dissolve in water. It is known as a powerful oxidizer. An oxidizer is a substance that helps things burn. This makes it a key part of rocket fuel. It is a main part of composite rocket propellant.

There are two main ways to make this substance. One way is to react ammonia with perchloric acid. This is a major way to make perchloric acid too. Another way uses a salt metathesis reaction. This uses ammonium salts and sodium perchlorate. This works because the new salt does not dissolve easily. Its solubility is only about 10% of sodium perchlorate.

This chemical has a long history of use. It has been used in many types of rockets. It was a part of the Space Shuttle Solid Rocket Booster. People also use it in military rockets. Amateur and hobbyist rocket users use it too. Some fireworks also use it to help them burn.

We must be careful with how we handle it. Strong heat can lead to explosions. The size of the particles matters a lot. Particles larger than 15 micrometres are a Class 4 oxidizer. Particles smaller than 15 micrometres are classified as explosives. Some accidents have happened because of its instability. These include the PEPCON disaster. It was also a suspected cause of the Port of Shahid Rajaee explosion.

This substance can also affect living things. It does not cause much harm if taken in once. For example, sodium perchlorate has an LD50 of 2–4g/kg. The body gets rid of it quickly after it is eaten. However, long-term exposure is a different story. It can cause many thyroid problems. This happens because the body takes it in instead of iodine.

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