How to calculate pH of HCl in water?

How to calculate the theoretical pH of a 0.1 mol/l solution of NaCl?

• What is my procedure in calculating the pH of a 0.1mol/l solution of NaCl? I found the pH of water, in an experiment to be 4.59. How do I use it in the a strong acid and strong base buffer, which I believe doesn't exist? i.e NaCl ----------------> Na+ + Cl- Na+ + H2O ----------> NaOH + H+ or Cl- + H2O ------------> HCl + OH- how am I to calculate the theoretical pH? Using auto ionization of water? how? please tell me the steps.

• Answer:

  NaOH and HCl are strong electrolytes so you must use the auti ionization of water [H+] [OH-]= 1.0 x 10^-14 [H+]= [OH-] = 1.0 x 10^-7 M pH = 7.0