SAT Chemistry

Category - Multiple Choice

What is the concentration of H+ ions in a solution that has an OH- concentration of 1x10-4 molar?
  1. 1x10-10 molar
  2. 1x10-9 molar
  3. 1x10-8 molar
  4. 1x10-5 molar
  5. 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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