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Ammonium Iodide
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Description
Ammonium Iodide
Other Names: Ammonium salt of hydroiodic acid
CAS Number: 12027-06-4
Chemical Formula: NH₄I
Molar Mass: 144.94 g/mol
Appearance: White to pale yellow crystalline solid (may darken with light exposure)
Description:
Ammonium iodide is an inorganic salt composed of ammonium (NH₄⁺) and iodide (I⁻) ions. It is highly soluble in water and alcohol, forming clear solutions. The compound is light-sensitive and may slowly decompose upon prolonged exposure to air and moisture, releasing iodine and turning yellowish. It is mainly used in photographic chemistry, analytical applications, and as a source of iodide ions in laboratories.
Chemical and Physical Properties
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Density: ~2.51 g/cm³
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Melting Point: ~551°C
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Boiling Point: Decomposes before boiling
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Solubility in Water: Highly soluble
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Solubility in Other Solvents: Soluble in ethanol and methanol
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Odor: Odorless
Applications
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Photographic Chemistry: Used in emulsion and developing processes.
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Analytical Reagent: Source of iodide ions in chemical analysis and reactions.
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Organic Synthesis: Sometimes used in alkylation and iodination reactions.
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Medical and Research Use: Employed in iodide-related studies and experiments.
Safety
Signal Word: Warning
H315 (86.8%): Causes skin irritation [Warning Skin corrosion/irritation]
H319 (88.7%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H335 (86.8%): 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
Handling and Storage
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Handling Precautions: Avoid exposure to light and moisture. Prevent contact with oxidizing agents. Handle in well-ventilated areas using suitable PPE.
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Storage Conditions: Store in a tightly sealed container in a cool, dry, and dark place. Protect from moisture, air, and direct sunlight.