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What is the concentration of OH^– in a solution with a H^+ concentration of 1.3×10^-4 M?(a) 7.7×10^-10M(b) 7.7×10^-9M(c) 7.7×10^-11M(d) 7.7×10^-12MThis question was posed to me in an interview.Question is taken from Ionization of Water, Weak acids and Weak Bases topic in portion Water Basics of Biochemistry

Answer»

The CORRECT ANSWER is (c) 7.7×10^-11M

To explain I would say: Kw = [H^+][OH^–]

SOLVING for [OH^–]gives

[OH^–]=(Kw)/([H^+]) = (1.0 X 10^-14)/(1.3 X 10^-4) M

= 7.7 × 10^-11M.


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