H2SO4 Acid (Sulfuric Acid): Properties, Safety Hazards & Troubleshooting

H2SO4 acid is an essential industrial chemical but has highly corrosive. Article by Loc Thien Compiled to help you understand the characteristics - risks - spill handling measures and first aid in case of contact for safe operation.

1. What is H2SO4 acid?

H2SO4 (sulfuric acid, vitriol) is a strong inorganic acid consisting of sulfur, oxygen, and hydrogen. The scale of H2SO4 production often reflects the level of industrial development. Common production processes: contact, wet acid, lead chamber (history),…

2. Physical properties

Liquid colorless to pale yellow, odorless; infinitely soluble in water, strongly exothermic when diluted (always pour acid into water).

3. Chemical properties (some typical reactions)

Dilute H2SO4: strongly acidic; reacts with metals before H₂ (except passivated metals like Pb), basic oxides, bases and carbonates.

• Fe+H₂SO₄ → FeSO₄ + H₂↑
• FeO + H₂SO₄ → FeSO₄ + H₂O
• Na₂CO₃ + H₂SO₄ → In₂SO₄ + CO₂↑ + H₂O
• H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O (ratio 1:2); 1:1 creates NaHSO₄.

Concentrated H2SO4: In addition to being acidic, it is also strong oxidizer , and dehydrating agent.

• Cu + 2H₂SO₄(concentrated) → CuSO₄ +SO₂↑ + 2H₂O
• Road + H₂SO₄(special) → dehydration, creating black carbon columns and heat.

4. Is H2SO4 acid toxic?

H2SO4 causes severe chemical burns Skin/eye contact; mist causes respiratory irritation. Ingestion may cause gastrointestinal necrosis. Always wear PPE (gloves, goggles, acid-respirator mask) and operate in a well-ventilated area.

5. Handling of H2SO4 spills (practical summary)

• Isolation & Control: cordon off, build dikes; ventilate if safe.
• Absorb: Spread absorbent material (chemical absorbent pillow/pad, inert powder); collect from edge to center.
• Controlled neutralization: Dùng NaHCO₃ or Na₂CO₃ spread wait a minute, avoid rapid reaction causing splashing/high heat; monitor pH of test paper.
• Hazardous waste collection: packaging, labeling; delivery according to environmental regulations.
• Detoxify the area: Rinse with water several times; check for toxic gases if necessary.

6. First aid when exposed to H2SO4 acid

• Eye: Flush with water continuously for ≥15–20 minutes, remove contact lenses if present; seek medical attention immediately.
• From: Flush with water for several minutes; remove contaminated clothing; apply sterile dressing and seek medical attention.
• Inhalation of vapor: Remove to fresh air; provide respiratory support if needed; monitor medically.
• Ingestion: No induce vomiting; urgent transfer to hospital.

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