[alicia_tan2113]

One mole of compound X gives three moles of ions in aqueous solution. X reacts with ammonium carbonate to give an acidic gas.

What is compound X?

A Calcium Hydroxide
B Ethanoic Acid
C Sodium Hydroxide
D Sulfuric Acid
~~~~~~~~~~~

I know the answer is D. Sulfuric acid. What I would like to know is why.

[opti384]

Your first hint will be this

One mole of compound X gives three moles of ions in aqueous solution.

Sulfuric acid is H₂SO₄ and one mole of sulfuric acid can give off two moles of H⁺.

Moreover the reaction of sulfuric acid with ammonium carbonate will be

(NH₄)₂CO₃ + H₂SO₄  (NH₄)₂SO₄ + CO₂ + H₂O

[alicia_tan2113]

I roughly understand, but why can't it be the other options?

[Borek]

Try to write dissociation reactions for other cases, try to write reaction equations for other substances with ammonium carbonate. Do the results (number of ions, products) fit the description given?

[alicia_tan2113]

OMG! I get it! Thanks alot! Thanks!