Question

The gas originally called ‘fixed air’?

Answer 1

• Carbon dioxide gas (${\mathrm{CO}}_2$) is the type of gas that was originally called 'fixed air.
• Dr. Joseph Black was the scientist who noticed that upon heating calcium carbonate (${\mathrm{CaCO}}_3$) it produces a gas that was denser than air and could not sustain fire.
• That gas was known as fixed air, but we now know it as carbon dioxide (${\mathrm{CO}}_2$).
• Reaction involved- ${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\to \mathrm{CaO}{\left(\mathrm{s}\right)}_{}+{\mathrm{CO}}_2\left(\mathrm{g}\right)$

Calcium Calcium Carbon dioxide

carbonate oxide