# Problem: A weak acid was 13% ionized. What would be the pH of a 0.50 M solution and what is the pKa of the acid?A. pH = 1.2; pKa = 2.0B. pH = 4.3; pKa = 3.9C. pH = 2.5; pKa = 3.2D. pH = 4.8; pKa = 6.5E. pH = 11.8; pKa = 11.8

###### FREE Expert Solution

We’re being asked to determine the pH of a 0.50 M weak acid that is 13 % ionized.

Recall that the percent ionization is given by:

Also recall that pH is given by:

$\overline{){\mathbf{pH}}{\mathbf{=}}{\mathbf{-}}{\mathbf{log}}{\mathbf{\left[}}{{\mathbf{H}}}_{{\mathbf{3}}}{{\mathbf{O}}}^{{\mathbf{+}}}{\mathbf{\right]}}}$

###### Problem Details

A weak acid was 13% ionized. What would be the pH of a 0.50 M solution and what is the pKa of the acid?

A. pH = 1.2; pKa = 2.0

B. pH = 4.3; pKa = 3.9

C. pH = 2.5; pKa = 3.2

D. pH = 4.8; pKa = 6.5

E. pH = 11.8; pKa = 11.8