What is the [H+] in Pure Water

Question

What is the [H+] in pure water?
A) 1X10-7 mol/L
B) 1X10-14 mol/L
C) 7 mol/L
D) 1X107 mol/L
E) 1X1014 mol/L

Accepted Answer

The concentration of hydrogen ions ([H+]) in pure water at 25°C is 1X10^-7 mol/L, due to the autoionization of water where water molecules dissociate into hydrogen ions (H+) and hydroxide ions (OH-) in equal amounts.