Daily Chemical
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Citric acid
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Citric acid is an important organic acid, also known as citric acid. It is a colorless crystal and often contains one molecule of crystal water. It is odorless, has a strong acid taste, and is easily soluble in water. The calcium salt is easier to dissolve in cold water than in hot water. This property is often used to identify and separate citric acid. Anhydrous citric acid can be obtained by controlling the appropriate temperature during crystallization. It has many uses in industry, food industry, cosmetics industry, etc.
Basic Information
Chinese name: citric acid
Generic name of drug: citric acid
English name: citric acid
Chemical name: 2-Hydroxy-succinic acid
English name 2: 2-hydroxy-1,2,3-propanetricarboxylic acid
CAS No.: 77-92-9
EINECS number: 201-669-1 [1]
Molecular formula: C6H8O7
Molecular weight: 192.14
Appearance and properties: white crystalline powder, odorless.
Melting point (°C): 153°C
Boiling point (℃): 175℃
Relative density (water = 1): 1.6650
Flash point (℃): 100
Ignition temperature (℃): 1010.87 (powder)
Upper explosion limit%(V/V): 8.01333......(65℃)
Dissociation constant (25℃): Ka1=7.4×10^-4, Ka2=1.7×10^-5, Ka3=4.0×10^-7
Solubility: soluble in water, ethanol, acetone, insoluble in ether and benzene, slightly soluble in chlorine solution. The aqueous solution is acidic.
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