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equation (e-kwa´zhәn)   an expression of equality between two parts.
 

Henderson-Hasselbalch equation  a formula for calculating the pH of a buffer solution such as blood plasma, pH = pKa + log [BA/HA]; [HA] is the concentration of a free weak acid; [BA] the concentration of the ionized form of this acid; pKa the acid dissociation constant, a measure of the ionization equilibrium of the acid.





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