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Citric acid(CAS.NO:77-92-9) is a weak organic acid with the formula C6H8O7. It is a natural preservative/conservative and is also used to add an acidic or sour taste to foods and soft drinks. In biochemistry, the conjugate base of citric acid, citrate, is important as an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms. At room temperature, citric acid is a white crystalline powder. It can exist either in an anhydrous (water-free) form or as a monohydrate. The anhydrous form crystallizes from hot water, while the monohydrate forms when citric acid is crystallized from cold water. The monohydrate can be converted to the anhydrous form by heating above 78 °C. Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 °C. In chemical structure, citric acid shares the properties of other carboxylic acids. When heated above 175 °C, it decomposes through the loss of carbon dioxide and water (see decarboxylation). Citric acid is a slightly stronger acid than typical carboxylic acids because the anion can be stabilized by intramolecular hydrogen-bonding from other protic groups on citric acid. Chemical Properties: White crystalline powder General Description: Colorless, odorless crystals with an acid taste. Denser than water. Air & Water Reactions: The pure material is moisture sensitive (undergoes slow hydrolysis) Water soluble. Reactivity Profile: Citric acid reacts with oxidizing agents, bases, reducing agents and metal nitrates . Reactions with metal nitrates are potentially explosive. Heating to the point of decomposition causes emission of acrid smoke and fumes. Health Hazard: Inhalation of dust irritates nose and throat. Contact with eyes causes irritation. Fire Hazard: Behavior in Fire: Melts and decomposes. The reaction is not hazardous. Biological Activity: Commonly used laboratory reagent. Meimei is a website edit person of the guidechem.com.Guidechem.com was established with the aim to build the most comprehensive database of chemical products and contain most complete suppliers, making chemical trading more efficient, convenient and safe. facilitate global chemical trading and bring chemical buyers & sellers from all over the world to one common chemical platform.And now guidechem.com B2B network has been named "2010 China's e-commerce website industry TOP100".
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