posted by LT .
The ionization constant of an acid, HX is 1 x 10^-5. When a mixture of 0.100 mol HXand 0.100 mol of NaX is diluted to a volume of one liter by addition of wate, the pH of the resulting solution is very nearly
Ka for HX = (H^+)(X^-)/(HX)
Solve for (H^+) and convert to pH.