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Aids are donators of protons.
an acid which is capable of complete ionisation, that is, which can completely split up into ions is called strong acid. 
A concentrated acid is the purest form of acid. It does not contain even the smallest trace of water in it.
a strong acid has more hydrogen ion and weak acid has less hydrogen ion...
strong acids ionizes completely & weak acids does not ionizes completely
The concept of strong acid and concentrated acid is totally different.
a stong acid is an acid which has a high degree of ionisation as well as is extremely reactive i.e, readily splits into ions;
while a concentrated acid contains relatively greater concentration of acid as compared to acid and 30% water :) or when there is no trace of water in it...