A solution has a pH of 2.5. What is [H+] in mol/L?

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1.0 × 10⁻² 5.0 × 10⁻³ 3.16 × 10⁻³ Correct 2.5 × 10⁻³

pH = -log [H+] , 2.5 = -log [H+] , [H+] = 10⁻².⁵ ≈ 3.16 × 10⁻³ .

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