Question

An acid is a compound which, when dissolved is water give ____(hydronium/hydroxide) ions as the only ____(positive/negative) ions.

Answer 1

Acids

• The word acid is derived from the word acidus which means sour.
• Acids on dissolving in water gives out hydrogen ions $\left(H^{+}\right)$.
• These $\left(H^{+}\right)$ions are also known as hydronium ions.

Hence, an acid is a compound which, when dissolved in water gives hydronium ions as the only positive ions.