<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Citric acid is a weak organic acid that has the chemical formula C O . It occurs naturally in citrus fruits . In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms . </P> <P> More than a million tons of citric acid are manufactured every year . It is used widely as an acidifier, as a flavoring and chelating agent . </P>

What is the chemical composition of citric acid
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