6. The pH of a substance equals -log [H+], where [H + ] is the concentration of hydrogen ions. The concentration of hydrogen ions in pure water is 10^-7 and the concentration of hydrogen ions in
a sodium hydroxide solution is 10^-14. What is the difference of the ph levels of pure water and
sodium hydroxide solution?* LS
(6 Points)
7
-7
-21
10000000