Question

1. What do you understand by the term, acid?
2. Name the positive ion formed when an acid is dissolved in water.
3. Draw the structure of this ion.

Answer 1

1. Acids are defined as compounds which contain one or more hydrogen atoms, and when dissolved in water, they produce hydronium ions (H₃O⁺), the only positively charged ions.
2. Hydronium ion [H₃O]⁺
3. \[\begin{bmatrix}\begin{array}{cc}
   \ce{H}\\
   \ce{H^{\bullet}_{×}\overset{\bullet\bullet}{\underset{\bullet\bullet}{\mathbf{O}}}^{\bullet}_{×}H}\
   \end{array}\end{bmatrix}^+\]