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Citric acid is a tricarboxylic acid that is propane-1,2,3-tricarboxylic acid bearing a hydroxy substituent at position 2. It is an important metabolite in the pathway of all aerobic organisms. When citrate trianion is part of a salt, the formula of the citrate trianion is written as C. 3. Lemons, oranges, limes, and other citrus fruits contain high concentrations of citric acid. Citric acid occurs in a variety of fruits and vegetables, most notably citrus fruits. What is Citric Acid? Citric Acid is a weak acid with a chemical formula C 6 H 8 O 7. It can occur in two forms – monohydrate or water-free (anhydrous). This acid is usually found in citrus fruits like lemons, oranges etc. It is considered as a tribasic acid. It is odourless, sour in taste, and appears as a white crystalline solid. Citric acid is a type of weak acid that has a chemical formula of C6H8O7 C 6 H 8 O 7. Citric acid is an organic compound. It is colourless, odourless, and sour in flavour. It occurs naturally in high quantities in all the citrus fruits. It has a structure of a monoclinic crystal.