Question

What is the chemical name of oleum?

Answer 1

Oleum

• The chemical name of oleum is pyrosulphuric acid.
• When sulfur trioxide$\left({\mathrm{SO}}_3\right)$ reacts with sulfuric acid$\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$, the formation of oleum takes place.
• The chemical reaction for the formation of oleum is as follows:-

$$\begin{gathered} {\mathrm{SO}}_3\left(\mathrm{g}\right)+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{l}\right)\to {\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7\left(\mathrm{l}\right) \\ \mathrm{Sulfur}\mathrm{trixoide}\mathrm{Sulfuric}\mathrm{acid}\mathrm{Oleum} \end{gathered}$$

• The chemical formula of oleum is${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$.

Uses of oleum

• Oleum is used for the production of dyes.
• Oleum is used in nitrating reactions.