Question

Write the ionisation reaction of sulphuric acid showing the formation of hydronium ion.​

Answer 1

Sulphuric acid is a strong acid and when dissolved in water it produces hydronium ($H_3{O}^{+}$) ions. It dissociates in two steps as shown below,
$H_{2}S{O}_4+H_{2}O\leftrightarrow H_3{O}^{+}+HS{O}_4^{-}$
$HS{O}_4^{-}+H_{2}O\leftrightarrow H_3{O}^{+}+S{O}_4^{2-}$
These reactions indicate that one molecule of sulphuric acid produces two hydronium ($H_3{O}^{+}$) ions.