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The pH concept

The pH concept. [H + ] is cumbersome so the pH scale was created. pH is the negative logarithm of the hydrogen-ion concentration. pH = -log[H + ]. Sample pH problems 1 of 3. The hydrogen-ion concentration of a solution is 2.7 x 10 -10 mol/L. What is the pH of the solution. Answer

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The pH concept

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  1. The pH concept • [H+] is cumbersome so the pH scale was created. • pH is the negative logarithm of the hydrogen-ion concentration. • pH = -log[H+]

  2. Sample pH problems1 of 3 • The hydrogen-ion concentration of a solution is 2.7 x 10-10 mol/L. What is the pH of the solution. • Answer • pH = -log[2.7 x 10-10] • pH = 9.6

  3. Sample pH problems2 of 3 • The pH of a solution is 6.8. What is the [H+]? • Answer • 6.8 = -log [H+] • -6.8 = log [H+] • 10x (-6.8) = log [H+] 10x • 1.6 x 10-7 mol/L = [H+]

  4. Sample pH problems3 of 3 • What is the pH of a solution if the [OH-] = 4.0 x 10-11 mol/L • Answer • [H+] x 4.0 x 10-11 mol/L = 1.0 x 10-14 M2 • [H+] = 2.5 x 10-4 mol/L • pH = -log(2.5 x 10-4 mol/L) • pH = 3.6

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