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Weak acids don't fully dissociate in solution, so there is a lower concentration of H+ ion in solution. However for strong acids that fully dissociate, there are more H+ ions in solution which makes the solution more acidic and hence, have a lower pH value as compared to weak acids.
Remember that the pH scale is logarithmic and starts at 0, with the pH getting more acidic the closer to 0 one gets from 7 and more basic the farther from 7 one goes in the opposite direction. A weak acid will not dissociate as willingly as a strong acid (which are often very ionic in composition, such as HCl or HI), meaning that there will simply be fewer reactions resulting in [H3O+ formation when compared to a strong acid.
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