Ammonium thiocyanate, with the chemical formula NH4SCN, has the CAS number 1762-95-4. It appears as a colorless crystalline solid with a faint odor. The basic structure of ammonium thiocyanate consists of an ammonium ion (NH4+) and a thiocyanate ion (SCN-) bonded together. This compound is highly soluble in water. Ammonium thiocyanate is considered to be relatively safe to handle, but it may cause irritation to the skin, eyes, and respiratory system. It is important to avoid ingestion or inhalation of this compound. In case of contact, it is recommended to rinse the affected area with plenty of water. Ammonium thiocyanate should be stored in a cool and dry place, away from direct sunlight.
Applicable Fields
Photography: Ammonium thiocyanate is commonly used in photography as a source of thiocyanate ions. It is used in the preparation of light-sensitive emulsions and as a fixing agent in the development process. The mechanism of action in photography involves the reaction between ammonium thiocyanate and silver ions, which forms a stable complex that can be easily washed away.
Chemical Analysis: Ammonium thiocyanate is also used in chemical analysis as a reagent. It is particularly useful in the determination of iron(III) ions, as it forms a deep red complex with iron(III) ions. This complex can be quantitatively measured to determine the concentration of iron(III) in a sample.
Storage
Conditions: Store in a cool and dry place.
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