Problem 4.5: What is the concentration of H and OH at pH 4
From Chapter 4 Problem Set. Level 2: Applied Thinking.
Question
What is the concentration of [H⁺] and [OH⁻] at pH 4? At pH 10? Show how pH + pOH = 14 holds for each.
Answer
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pH 4: [H⁺] = 10⁻⁴ mol/L, pOH = 10, [OH⁻] = 10⁻¹⁰ mol/L. Check: 4 + 10 = 14.
pH 10: [H⁺] = 10⁻¹⁰ mol/L, pOH = 4, [OH⁻] = 10⁻⁴ mol/L. Check: 10 + 4 = 14.