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Determine the acidity of solutions

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Which is more acidic, a solution with a pH = 4.74 or a solution that has [H+] of 8.6x10-5M? Show how you arrive at your answer.

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The answer determines the acidity of solutions

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[H+]= 0.000086 M

pH=(-)log[H+]= 4.07

A stronger acid ...

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