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A strong acid completely dissociates into an H+ ion and an anion.

pH is defined as pH = -log(H+ concentration)

So if you have 0.01 mole hydrochloric acid (HCl) per 1 mole solution, since

each mole HCl contributes a mole of H+ and a mole of Cl-

then you would have H+ concentration of 0.01

pH = -log(0.01) = -(-2) = 2, so the pH = 2

Note that higher H+ concentrations result in lower pH number

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14y ago

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