Calculate the [OH−] and the pH of a solution with an [H+]=4.9×10−13 M at 25 °C .
[OH−]= M
pH=

Calculate the [H+] and the pH of a solution with an [OH−]=2.2×10−7 M at 25 °C .
[H+]= M
pH=

Calculate the [H+] and the [OH−] of a solution with a pH=8.66 at 25 °C .
[H+]= M
[OH−]= M