The Acid-Dissociation Constant at 25 $10 ^ { - 8 }$

Multiple Choice

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × $10 ^ { - 8 }$ .At equilibrium,the molarity of $\mathrm { H } _ { 3 } \mathrm { O } ^ { + }$ in a 0.030 mol L^-1 solution of HClO is ________.

A) 1.52 mol L^-1
B) 3.3 × 10^-10 mol L^-1
C) 4.52 mol L^-1
D) 0.030 mol L^-1
E) 3.0 × 10^-5 mol L^-1