What is the hydronium ion concentration of a 0.010 M solution of acetic acid? Ka for acetic acid is 8x10⁻⁵.
A. 1.8x10⁻³
B. 1.8x10⁻⁵
C. 1.0x10⁻²
D. 1.8x10⁻⁷
E. 4.2 10⁻⁴