Citric acid is a weak organic acid. It is a natural preservative and is also used to add an acidic, or sour, taste to foods and soft drinks. In biochemistry, it is important as an intermediate in the citric acid cycle and therefore occurs in the metabolism of virtually all living things. It can also be used as an environmentally benign cleaning agent.

Acido citrico (CA) acido citrico anidro, noto anche come citrato, con la forma molecolare C₆H₈O₇, è un importante acido organico.È un cristallo incolore, inodore, fortemente acido, facilmente solubile in acqua, un regolatore di acidità (GB2760 -- 2014) e un additivo alimentare.