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Hydronium ion concentration using Henderson-Hasselbalch equation.

What is the hydronium ion concentration of a solution of 0.700 M acid and 0.440 M of its conjugate base if the ionization constant is 3.59 x 10-8?

A.1.13 x 10-7
B.5.71 x 10-8
C.2.47 x 10-7
D.2.26 x 10-8
E.8.98 x 10-8

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