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Trisodium citrate

physical science Maturity 5-7 Next article →

Trisodium citrate is a special chemical compound. Its formula is Na3C6H5O7. You might also hear it called sodium citrate. It has a salty and mildly tart taste.

Sodium citrate crystals
Sodium citrate crystals

This substance is also a mild base. A base is the opposite of an acid. It is very useful in many parts of our lives. It helps with food, medicine, and even cleaning.

In the kitchen, this salt works in many ways. It can act as a flavoring agent. You might find it in club soda or wine. It is also an emulsifying stabilizer for cheese. This means it helps the cheese melt smoothly. It stops the fats from separating and getting greasy.

Citric acid speciation
Citric acid speciation

It also acts as a buffering agent. A buffer is something that resists changes in pH. This helps keep the acidity of food steady. You can find it in yogurt, jams, and ice cream.

Doctors have used this salt for a long time. In 1914, Albert Hustin and Luis Agote used it for blood transfusions. They used it as an anticoagulant. An anticoagulant is a way to stop blood from clotting. Later, in 1915, Richard Lewisohn found the right concentration.

Sodium citrate crystals
Sodium citrate crystals

This helped make the process safe. Today, it is still used in blood banks. It is even used in blood-collection tubes to keep blood flowing.

There are many specific facts about how it works. In the blood, the citrate ion chelates calcium ions. This means it grabs onto calcium to form complexes. This stops the blood from clotting. In 2003, researchers found it might help runners. They used 0.5 g/kg of body weight. This helped improve 5 km run times by 30 seconds.

Citric acid speciation
Citric acid speciation

It is also a main part of WHO oral rehydration solutions.

This salt is useful for more than just eating or medicine. It can help clean machines. It is good for removing scale from boilers. It can also clean automobile radiators. You can even see it when you take an antacid. When tablets like Alka-Seltzer dissolve in water, they create this compound.

Sodium citrate crystals
Sodium citrate crystals

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File:Citric acid speciation.svg
Citric acid speciation.svg
File:Sodium citrate crystals.png
Sodium citrate crystals.png
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