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Question
What is the concentration of OH⁻ in a solution with a H⁺ concentration of 1.3×10⁻⁴ M?
Options:
A .  7.7×10⁻¹⁰ M
B .  7.7×10⁻⁹ M
C .  7.7×10⁻¹¹ M
D .  7.7×10⁻¹² M
Answer: Option C
Answer: (c).7.7×10⁻¹¹ M

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