Henderson equation for pH

Henderson equation for pH

[′hen·dər·sən i¦kwā·zhən fər ¦pē′āch]
(physical chemistry)
An equation for the pH of an acid during its neutralization: pH = pKa + log [salt]/[acid], where pKa is the logarithm to base 10 of the reciprocal of the dissociation constant of the acid; the equation is found to be useful for the pH range 4-10, providing the solutions are not too dilute.
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