# Ph Formula

pH is measure of the amount of hydrogen ion activity (H+in solution, and therefore its alkalinity or acidity. Even though pH is a unitless value but it is not a random scale.  The value is due to the activity of H+ ion in the solution. pH is described as “the negative of the logarithm of the molar hydronium-ion concentration.”

pH Formula is expressed as

$\dpi{120}&space;\large&space;pH=-log[H_{3}O^{+}]$

The pH Formula can also be expressed as

$\dpi{120}&space;\large&space;pH=-log[H^{+}]$

pH Formula Related Problems

Problem 1: Find out the pH of the solution in which the concentration of hydronium ion is 8.0 ×10-8M.

$\dpi{120}&space;\large&space;pH=-log[H_{3}O^{+}]$