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Citric acid is a weak organic acid that has the molecular formula C6H8O7. 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. citric acid is predominantly used as a flavoring and preserving agent — especially in soft drinks and candies. It's also used to stabilize or preserve medicines and as a disinfectant against viruses and bacteria. Citric acid is a compound originally derived from lemon juice.