Answer :

According to Arrhenius theory:


Acids are the substances which release hydrogen ion when dissolved in water.


For example: HCl H+ + Cl-


HNO3 H+ + NO3-


These both are acids (hydrochloric acid and nitric acid) because they release H+ ion in the aqueous solution.


The acids which are completely ionized in the solution are called strong acids. But some acids are incompletely ionized in water, are called weak acids.


Bases are the substances which release hydroxyl ions (OH-) when dissolved in water.


For example NaOH K+ + OH-


KOH K+ + OH-


These both are bases (sodium hydroxide and potassium hydroxide) because they release OH- ion in the aqueous solution.


The bases which are completely ionized in the solution are called strong bases. But some bases are incompletely ionized in water, are called weak bases.


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