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strong acid donates H+, and weak acid doesn't refuse to donate H+, weak acid also donates H+. no matter strong acid or weak acid, when a substance in solution produces hydrogen ions, H+, it's called acid.
the difference between strong acid and weak acid is:
when an acid dissolved in water, and all of its molecules are ionised competely, it called strong acid; if an acid dissolved in water and only some of its molecules are ionised, it called weak acid.
eg of strong acid: HCl ---> H+ + Cl- (ionised competely)
eg of weak acid: CH3COOH ----> H+ + CH3COO- (ionised partially)
a base combines with the hydrongen ion of an acid, but without producing hydrogen gas.
when a base dissolved in water, all of its molecules are ionised competely, it is strong base; for weak base, only some of its molecules are ionised.
eg of strong base: NaOH ---> Na+ + OH-
eg of weak base: NH3 + H2O ----> NH3+ + OH-
when an acid mix/reacts with a base, we don't call it's damaged, people called neutralisation. Neutralisation is: the H+ of an acid is removed by a base.
the neutralisation reaction is: OH- + H+ ----> H2O
eg of (full reaction) neutralisation: HCl + NaOH ----> NaCl + H2O
