The color of bromothymol blue is a function of this quantity.
This quantity changes down the length of the column during chromatofocusing. It is plotted on the x -axis of a speciation diagram. A gradient in this quantity is used to separate proteins in 2D SDS-PAGE before the separation based on size. Molecular biologists use Tris and EDTA to prevent swings in this quantity. Glass (*)  electrodes are used to measure this quantity. The solubility of magnesium hydroxide rapidly decreases as this quantity increases due to the common ion effect. The color of bromothymol blue is a function of this quantity. This quantity is equal to the difference between the percent ionization and the pKa according to the HendersonÂ–Hasselbalch equation. For 10 points, name this quantity that buffer solutions usually keep near seven.
This quantity changes down the length of the column during chromatofocusing.
pH  [or  power of hydrogen ; prompt on  isoelectric point  or  pI ]