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Praxis II: Chemistry Exam Prep

Category - Chemistry

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What is the concentration of H⁺ ions in a solution that has an OH^- concentration of 1x10^-4 molar?

1x10^-10 molar
1x10^-9 molar
1x10^-8 molar
1x10^-5 molar
1x10^-4 molar

Explanation

Answer: 1x10^-10 molar

Solutions that contain hydronium and hydroxide ions obey the equation [H⁺] [OH^-] = 1x10^-14. Plugging the values from the problem into this equation gives [H+] (1x10^-4) = 1x10^-14. Solving for the concentration of H⁺ ions gives the correct answer, 1x10^-10 molar.

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