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A strong acid has a tendancy to dissociate in water, and therefore will have a higher concentration of H+ ions and a lower pH. In contrast, a weak acid will not dissociate as much, and will therefore have a lower concentration of H+ ions and a higher pH.
At the same concentration, weak acids will not dissociate as much as strong acids will. This means that weak acids have lower concentrations of H3O+ and therefore their pH will be closer to 7 while strong acids will have much lower pH because of their higher hydronium concentration.
The stronger the acid, the lower the pH of the solution. You would expect weak acids to have higher pH values. Also pH is equal to -log concentration of H+ ions in the solutions. Because of partial disassociation of weak acids, you get less H+ ions meaning a higher pH in comparison to strong acids that completely disassociate.
Weak acids are only partially ionized, in comparison to the strong acid that is completely ionized. With a lower concentration of [H+] in the solution, the weak acid would have a higher pH. Conversely, the strong acid would have a higher concentration of [H+] in the solution, resulting in a lower pH.
Strong acids disassociate almost completely into hydronium ions, while weak acids only partially disassociate into hydronium ions. If the two acids are at the same concentration, the concentration of hydronium ions will be less for the weak acids. Since pH is the -log of the concentration of hydronium ions, the more hydronium ions there are, the lower the pH will be.
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