pH Calculator
Calculate pH, pOH, and hydroxide concentration from hydrogen ion concentration.
The pH Calculator computes the pH of a solution from its hydrogen ion concentration [H+]. The pH scale ranges from 0 to 14, where values below 7 are acidic, 7 is neutral, and above 7 is basic.
Enter the hydrogen ion concentration in moles per liter (mol/L). The calculator uses the formula pH = -log10[H+] and also computes pOH (14 - pH) and the hydroxide ion concentration [OH-].
Understanding pH is vital in chemistry, biology, medicine, agriculture, and environmental science. Even small changes in pH can dramatically affect chemical reactions and biological processes.
Frequently Asked Questions
What does pH measure?
pH measures the acidity or basicity of a solution on a scale of 0-14. It is the negative logarithm (base 10) of the hydrogen ion concentration.
What is the relationship between pH and pOH?
At 25 degrees C, pH + pOH = 14. If pH is 3, then pOH is 11.
What is a neutral pH?
A pH of 7.0 is neutral at 25 degrees C, meaning the concentrations of H+ and OH- ions are equal (1 x 10^-7 M each).