distinguish between strong acids and weak acids

Dear student!
A strong acid is an acid which ionizes almost completely when dissolved in water to produce a high concentration of hydrogen [H+]ions while a weak acid is an acid which ionizes partially when dissolved in water to produce a low concentration of hydrogen [H+] ions. 

The strong acids are generally inorganic acids like HCl, H2SO4 , etc while the weak acids are generally organic acid with carboxylic acid (-COOH) groups as HCOOH (formic acid) , CH3COOH(acetic acid) etc.

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Acid solutions contain hydrogen ions. The higher the concentration of hydrogen ions, the lower the pH. Hydrochloric acid is a strong acid and ethanoic acid is a weak acid. Strong acids are fully ionised but weak acids are only partly ionised in solution.
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