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OpenStudy (anonymous):
is the acid HCl has a pH of about 1.5; it is therefore three times as strong as coffee, which has a pH of about 4.5?
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OpenStudy (anonymous):
No. You haven't really defined "strength," but a reasonable definition, which would be the concentration of H+ ions, would imply that the "strength" of a solution with pH 1.5 is 1000 times greater than that of a solution with pH 4.5. pH is a logarithmic scale, like the Richter scale for earthquakes. Each unit increase in pH means a tenfold increase in H+ concentration.
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