What is the hydrogen ion concentration of orange juice that has a pH of 1?

Use the relationship pH = −log₁₀[H⁺], so a pH of 1 means [H⁺] = 10⁻¹ mole per liter. Since 10⁻¹ = 0.1, the hydrogen ion concentration is 0.1 mole per liter, choice A.

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