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Chemical Name: Sulfuric Acid
Common Synonyms: Oil of Vitriol
Chemical Formula: H2SO4
CAS Number: 7664-93-9
Appearance: Clear, odorless, oily liquid
Usage: Widely found in battery acid, fertilizers, industrial cleaning, and chemical synthesis
Main Hazards: Corrosive to metals and tissue, causes severe burns, reacts violently with water
Health Risks: Inhalation may burn respiratory tract; skin or eye contact may result in deep wounds, blindness. Swallowing, even in small amounts, can damage mouth and digestive system
Environmental Concerns: Highly toxic to aquatic life; acid spills damage ecosystems fast
Hazard Classification: Acute toxicity, severe skin burns, serious eye damage
Major Component: Sulfuric Acid approximately 95–98% by weight
Potential Impurities: Trace metals, water, oxides of nitrogen as byproducts depending on source and manufacturing method
Physical Properties Contribution: Its concentration boosts acidity and corrosive strength
Inhalation: Move affected person to fresh air immediately, loosen clothing around the neck, get medical help for any breathing difficulty
Skin Contact: Rinse skin fast with plenty of water, never attempt neutralization, remove contaminated clothing quickly
Eye Splash: Flush eyes with water nonstop for 15–30 minutes or until professional help arrives, keep eyelids apart
Ingestion: Do not induce vomiting, rinse mouth with water if conscious, never give anything by mouth to an unconscious person, seek urgent medical care
Suitable Extinguishing Media: Use dry chemical, CO2, or foam — water must never be sprayed directly onto acid
Dangers from Burning: Acid itself does not burn, but reacts fiercely with combustibles, producing toxic sulfur oxides
Precautions for Fire Responders: Firefighters need chemical-resistant gear, a self-contained breathing apparatus, and careful method to avoid splatter or runoff
Spill Response: Evacuate immediate area, ventilate, cordon off hazard zone
Containment Method: Use inert absorbent material such as earth, vermiculite, not sawdust or combustible material
Cleanup: Shovel acid-soaked matter into compatible containers, neutralize only under trained supervision, dispose safely
Personal Protection: Acid-resistant gloves, boots, apron, eye and face protection essential during cleanup
Handling Precautions: Only transfer using acid-rated pumps and containers; never add water directly, always pour acid into water slowly to avoid dangerous reactions or eruptions
Storage Conditions: Keep in tightly closed, vented acid-resistant containers away from metals, organics, bases, direct sunlight, and sources of heat
Segregation: Store separately from incompatible substances like chlorates, nitrates, combustibles and bases
Structural Protection: Floors and shelves must resist acid corrosion, secondary containment for leaking possible
Permissible Exposure Levels: Occupational exposure limits often restricted to 1 mg/m³ for airborne mist
Controls: Local exhaust ventilation, closed systems, fume hoods crucial where acid mist may occur
Personal Protection: Chemical splash goggles, face shield, acid-resistant gloves, full body suit, and boots; eyewash stations and safety showers close by
Special Situations: Respiratory protection if ventilation falls short; only use filtered and rated respirators
Physical State: Oily, colorless to slightly yellow liquid
Odor: Neither pleasant nor strong, but pungent
Boiling Point: Roughly 290°C at atmospheric pressure
Melting Point: Around 10°C
Density: About 1.84 g/cm³ for concentrated acid
Solubility: Highly soluble in water, heat released on mixing
Reactivity: Attacks metals, organic material, concrete; forms hazardous hydrogen gas with some metals
Chemical Stability: Stable under controlled conditions, deteriorates over time in the presence of contamination
Reactive Dangers: Highly exothermic reaction with water, formation of toxic gases with combustibles and reducing agents
Hazardous Byproducts: Sulfur dioxide, hydrogen gas, sometimes sulfur trioxide if heated strongly
Acute Effects: Burns instantly; vapors sting throat and lungs, exposure can scar eyes and upper airway
Chronic Exposure Risks: Extended exposure to mist causes ongoing respiratory problems, dental erosion, skin sores. Repeated skin exposure leads to ulceration and pigment loss
Affected Systems: Eyes, skin, respiratory, digestive tract all at risk; no known safe level for contact with pure acid
Aquatic Danger: Lethal to water-dwelling organisms even in small amounts; acidification leads to fish death and kills microorganism populations
Soil Impact: Drops soil pH quick, destroys beneficial microbes, stunts plant life
Degradation: Dilutes in water but does not break down or become less toxic by itself; remnants can persist if not neutralized
Disposal Guidelines: Neutralize carefully under supervision, never pour down the drain or into surface water
Preferred Disposal Method: Recycled where industrial use allows, neutralized to safe pH, sent for hazardous materials processing
Regulatory Waste Status: Treated as hazardous waste in most countries because of long-term and acute risks
Transport Classification: Belongs to corrosive category; tightly regulated on roads, rails, and sea
Packing Requirements: Strong, leakproof, corrosion-resistant tanks, clear hazard labeling
Special Instructions: No storage with incompatible substances, secure against shifting or collision, immediate spill control materials on board
Accepted Limitations: Strict thresholds for storage, reporting, and worker exposure in workplace law
Environmental Controls: Mandated measures for spill prevention and reporting, penalties for improper disposal
Worker Protections: Guidelines outline emergency planning, required training, and annual review of exposure risk and competence
Labeling Rules: Prominent hazard symbols, risk phrases, and instructional signage required by law in industrial settings
