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Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 100g
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 Na2SO3 Natriumsulfit Hypo clear - 100g "Pin It")
Description
Sodium Sulfite
Other Names: Sodium sulphite, Natriumsulfit, Hypo clear
CAS Number: 7757-83-7
Sum Formula: Na₂SO₃
Molar Mass: 126.04 g/mol
Appearance: White crystalline or powdery solid
Chemical and Physical Properties
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Density: 2.63 g/cm³
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Melting Point: 33.4°C (heptahydrate), decomposes at ~500°C (anhydrous)
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Boiling Point: Decomposes before boiling
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Solubility in Water: Highly soluble (27 g/100 mL at 20°C)
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Solubility in Other Solvents: Slightly soluble in alcohol; insoluble in non-polar solvents
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Odor: Faint sulfurous odor (especially in moist air)
Applications
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Photographic Processing: Used as a fixer clearing agent ("hypo clear") to remove residual thiosulfate
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Water Treatment: Applied as an oxygen scavenger in boiler and cooling water systems
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Pulp and Paper Industry: Used in pulping processes and bleaching
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Chemical Industry: Reducing agent in various chemical syntheses
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Textile Processing: Employed in dyeing and dechlorination of fabrics
Safety
Signal Word: Warning
H302 (18.3%): Harmful if swallowed [Warning Acute toxicity, oral]
H314 (51.8%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
H315 (19.3%): Causes skin irritation [Warning Skin corrosion/irritation]
H319 (21%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
P260, P264, P264+P265, P270, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P351+P338, P305+P354+P338, P316, P321, P330, P332+P317, P337+P317, P362+P364, P363, P405, and P501
Handling and Storage
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Storage Conditions: Store in a dry, well-ventilated place away from moisture and oxidizing agents
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Handling Precautions: Avoid generating dust. Use protective equipment and ensure adequate ventilation during use