Six astronauts are still on the space station as part of a planned year-long stay in space, the longest tour of duty in the station's 15-year history.
The molecular formula of citric acid is C 6 H 8 O 7. The chemical formula for citric acid is best shown by a diagram of its complete structural formula. This shows how the atoms are arranged in the molecule. Citric acid has three carboxyl or-COOH groups and is triprotic in nature.
Citric Acid is a central compound in the citric acid cycle, a metabolic pathway in essentially all organisms that produces the energy used by cells. Some Citric Acid esters, such as Triethyl and Tributyl Citrate are plasticizers for resins, inks and polishes.