Which statement correctly defines pOH?

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Study for the IMAT Chemistry Exam. Access flashcards and multiple choice questions; hints and explanations included for each question. Prepare effectively for your exam.

Multiple Choice

Which statement correctly defines pOH?

Explanation:
pOH is defined as the negative logarithm of the hydroxide ion concentration: pOH = −log[OH−]. This parallels the definition of pH, which is −log[H+], so pOH specifically measures basicity by looking at how much hydroxide is present in solution. The statement involving hydrogen ion concentration describes pH, not pOH, so it’s not the correct definition for pOH. The idea of a ratio between pH and pOH isn’t a standard definition either. At 25°C, pH and pOH are related by pH + pOH ≈ 14, which helps connect the two concepts.

pOH is defined as the negative logarithm of the hydroxide ion concentration: pOH = −log[OH−]. This parallels the definition of pH, which is −log[H+], so pOH specifically measures basicity by looking at how much hydroxide is present in solution. The statement involving hydrogen ion concentration describes pH, not pOH, so it’s not the correct definition for pOH. The idea of a ratio between pH and pOH isn’t a standard definition either. At 25°C, pH and pOH are related by pH + pOH ≈ 14, which helps connect the two concepts.

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