Calculate pH and use it as a measure of acidity.

Question

What is the pH of an aqueous solution with [H3O+] = 4×10⁻¹³ M ?

What is the molar concentration of H3O+ in a cola that has a pH of 4.240?



Answer 1

pH = - log [H₃O] = -log 4x10^-13 = 12.4

[H3O] = 1x10^-4.240 = 5.75x10^-5 M