Define strong and weak acids with an example of each.

Strong acid: We know that strong acids have a higher concentration of Hydrogen ions. Therefore, acids that get completely dissociated in an aqueous solution and produce more hydronium ions or acids that give a high concentration of $H^{+}$ions on ionization in an aqueous solution are said to be strong acids. For example, Sulphuric acid $\left(H_{2}S{O}_4\right)$ Hydrochloric acid $\left(HCl\right)$and nitric acid etc.

Weak Acid: Weak acids have a lower concentration of hydrogen ions. Acids that don't dissociate completely in an aqueous solution and produce less concentration of hydronium ions or acids that give a low concentration of $H^{+}$ions on ionization in an aqueous solution are said to be weak acids. Weak acids have relatively low $pH$ values and are used to neutralize strong bases. For example, Acetic acid $\left(C{H}_{3}COOH\right)$ formic acid $\left(HCOOH\right),$citric acid, phosphoric acid, etc.