Question

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. What is the approximate pH of a solution if the concentration of hydrogen ions is 5.0 × 10–4 moles per liter?

2.7

3.0

3.3

3.6

Answer 1

3.3 
when you plug the [H+] you get..
-log(5x10^-4)
3.3

Answer 2

The answer eould be 3.3 per liter.

i wishes i knew the reasoning but i dont, sorry

hope this helped ;)