Weak acids show much higher pH values compared to strong acids. By using this online calculator, you can calculate pH value and H+ concentration of weak acids such as acetic acid (CH3COOH), formic (HCOOH) and more. There are lot of weak acids and their acidic strength depends on the dissociation constant value (Ka). You have to choose the weak acid and give the concentration of acid, calculator will calculate the pH value for you.
Dissociation constant values (Ka) of weak acids are varied with the temperature and Ka values were taken at 250C temperature in this calculator. Also, assumed that, dissociation of water is negligible compared to dissociation of weak acids. If weak acid concentration is very much low such as 0.00000001 mol dm-3, pH value is approximately close to the neutral state.
Calculating pH of weak acid is not easy as calculating pH of a strong acid. You need to know the dissociation constant of weak acid for calculation.
Strong acids readily and completely dissociates to Hydronium cations and respective anion. So, there is no important application of dissociation constant in pH calculation for strong acids as weak acids.