One equation for determining this quantity sets it equal to the pKa plus the log of conjugate base over acid concentration and is named for Henderson and Hasselbalch.
The Hammett function replaces this quantity when activity coefficients become highly variable. Anthocyanins are biological compounds used to measure this quantity, and the Bohr effect for hemoglobin states that binding of oxygen is dependent on this quantity. Activity of lysosomes is determined by alteration of this quantity, which can be measured using cresol red or various alizarin compounds. One equation for determining this quantity sets it equal to the pKa plus the log of conjugate base over acid concentration and is named for Henderson and Hasselbalch. Measured by chemical indicators, for 10 points, identify this quantity given by the negative log of the concentration of hydrogen ions, whose value is less than 7 for acids.
The Hammett function replaces this quantity when activity coefficients become highly variable.
pH [prompt on negative log of hydrogen until mentioned]