Antimony potassium tartrate, also known as tartar emetic, is a chemical compound with the molecular formula K2Sb2(C4H2O6)2·3H2O. It is a complex salt composed of potassium ions (K+), antimony(III) ions (Sb3+), and tartrate ions (C4H2O6^2-). Tartar emetic is a white or colorless crystalline powder that is highly soluble in water.

Tartar emetic has a long history of use in medicine, but its use has declined due to its toxicity and potential side effects. It was historically used as an emetic to induce vomiting in cases of poisoning. However, due to its toxicity and the availability of safer alternatives, it is no longer commonly used for this purpose.

Some key properties and uses of antimony potassium tartrate include:

1. Medical Use: Historically, tartar emetic was used as an expectorant in the treatment of respiratory conditions and as an antimonial drug for various medical purposes. However, its use has diminished due to the availability of more effective and less toxic medications.
2. Pesticide: Tartar emetic has been used as a pesticide, particularly as a molluscicide to control snails and slugs in agricultural settings. However, its use as a pesticide is now restricted due to its toxicity and environmental concerns.
3. Analytical Chemistry: Tartar emetic is used in certain analytical chemistry techniques and tests to identify and quantify certain substances.

Tartar emetic is considered toxic and should be handled with extreme care. It can cause various health effects, including gastrointestinal irritation, cardiovascular effects, and potential damage to the liver and kidneys. It is no longer recommended for medical or other uses due to its toxicity and the availability of safer alternatives. If exposed to tartar emetic, seek immediate medical attention.