L-Cysteine hydrochloride monohydrate
Chemical Structure and PropertiesMolecular FormulaChemical Formula:C3H7NO2S· HCl· H2O Molecular Weight: Approximately 175.64 g/molStructure: Composed of L-cysteine (an amino acid with a thiol group,−SH) bound to a hydrochloric acid (HCl) molecule and a water molecule (monohydrate). The thiol group is crucial for its redox properties. Physical CharacteristicsAppearance: White to off-white crystalline powderSolubility: Highly soluble in water (due to the ionic nature of HCl salt), slightly soluble in ethanol, insoluble in organic solventsOdor: May have a faint sulfurous smell (due to the thiol group), though the HCl salt form reduces volatilitypH: Aqueous solutions are acidic (pH ~ 1.5–2.5) due to the hydrochloric acid component
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