What is the pH of a solution with [H+] = 1 x 10-6 M.
Solution
pH is calculated by the formula
pH = - log [H+]
Substitute [H+] with the concentration in the question.
pH = - log (1 x 10-6)
pH = -(-6)
pH = 6
Answer
The pH of the solution is 6.
Acids and Bases - Calculating pH
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From Todd Helmenstine, for About.com
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