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Potassium citrate

physical science Maturity 5-7 Next article →

Potassium citrate is a special white powder. It is made of tiny crystals. This powder has no smell at all. It has a taste like salt. It is a salt of citric acid. Its chemical formula is K3C6H5O7. This substance is very good at soaking up water. We call this property hygroscopic. It can even turn into a liquid by soaking up water.

Making this powder is a neat way of working. Scientists start with citric acid. They add things like potassium bicarbonate or potassium carbonate. They might also use potassium hydroxide. This step is called neutralization. After that, they filter the liquid. Then, they evaporate the liquid away. This leaves behind the small grains of powder.

This powder helps people in many ways. It can help with kidney stones. It also helps with bladder stones. It works well for people with cystinuria. Doctors use it to help with heart rhythms too. It can help if a person has low potassium. In 2020, it was a very common medicine. It was the 297th most prescribed drug in the USA. Over one million prescriptions were written that year.

People use this powder in many places. Many soft drinks use it as a buffering agent. This helps control how sour the drink is. It is also used as a fire suppressant. It works well on kitchen fires. The powder blocks air from the fuel. It also absorbs heat to lower the temperature. This helps to put the fire out.

There are different ways to take this medicine. It can come in a liquid form. It can also come in pill tablets. Some pills are made to release slowly. Most liquid is diluted with water. This is because it can be hard on the stomach. It is absorbed quickly by the body. Then, it leaves the body through urine.

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