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Question

Which of the following is a volatile acid and which is non-volatile?

Sulfuric acid, Sulfurous acid


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Solution

Volatile and non-volatile acids:

  • Volatile acids vaporize very quickly.
  • Non-volatile acids do not vaporize quickly.

Sulfuric acid:

  • Sulfuric acid H2SO4 has a high boiling point i.e., 337 °C. Hence, it is a non-volatile acid.

Sulfurous acid:

  • Sulfurous acid H2SO3 has a low high boiling point i.e., -60 °C . Hence, it is a volatile acid.

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