What is the formula of sulfuric acid?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the formula of sulfuric acid?

Explanation:
Sulfuric acid has two hydrogens tied to a sulfate group, so the neutral formula is H2SO4. This fits with the sulfate structure (SO4) and the two acidic hydrogens; in water it can lose one proton to become HSO4−, and a second to form SO4^2−, which matches having two hydrogens in the original molecule. The other options don’t fit: H2SO3 would be sulfurous acid with three oxygens, and HSO4− or HSO3− are ions, not neutral acids.

Sulfuric acid has two hydrogens tied to a sulfate group, so the neutral formula is H2SO4. This fits with the sulfate structure (SO4) and the two acidic hydrogens; in water it can lose one proton to become HSO4−, and a second to form SO4^2−, which matches having two hydrogens in the original molecule. The other options don’t fit: H2SO3 would be sulfurous acid with three oxygens, and HSO4− or HSO3− are ions, not neutral acids.

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