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The PH Scale Measures How Acid or Base a Substance

Question 51

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The pH scale measures how acid or base a substance is. pH is defined as the negative logarithm of the hydrogen ion activity in an aqueous solution ah. Thus if ah = 0.01, then the pH = -log 0.01 = 2. Determine the pH of a liquid with ah = 0.00398107. Round your answer to the nearest hundredth.

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