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Di-Ammonium Hydrogen Citrate
Other Names: Diammonium citrate, Ammonium citrate dibasic
CAS Number: 3012-65-5
Chemical Formula: C₆H₁₄N₂O₇
Molar Mass: 214.18 g/mol
Appearance: White crystalline powder
Di-ammonium hydrogen citrate is a dibasic ammonium salt of citric acid. It is a water-soluble, slightly hygroscopic compound used in various laboratory and industrial processes, particularly as a buffering agent, complexing agent, and in metal treatment formulations.
Chemical and Physical Properties
Density: ~1.4 g/cm³
Melting Point: Decomposes above 185 °C
Solubility in Water: Soluble (approximately 200 g/L at 25 °C)
Odor: Odorless
pH (1% solution): Approximately 4–5
Applications
Analytical Chemistry: Used in buffer solutions and as a complexing agent for metal ions.
Electroplating: Acts as a complexant and pH buffer in metal finishing baths.
Textile Industry: Used in dyeing and printing processes.
Water Treatment: Helps to prevent scale formation by chelating metal ions.
Cosmetic Formulations: Occasionally used as a pH regulator in non-food applications.
Safety
Signal Word: Warning
H315 (44.4%): Causes skin irritation [Warning Skin corrosion/irritation]
H319 (92.1%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H335 (44.4%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501