Henderson-Hasselbach equation

Henderson-Hasselbach equation

the formula for calculating the pH of a buffer solution, which states that:

where pK is the dissociation constant of an acid. The variable term is really a ratio of concentration values and can be taken as being proportional to the amount of acid and base added in the buffer. For example, when 30 cm3 of 0.1 M NaOH is added to 100 cm3 of 0.1 M acetic acid and the pK for acetic acid is 4.73, we can estimate: