 At a neutral pH, as in the cytosol (pH = 7.0), the concentrations of the orthophoshoric acid and its three anions have the ratios
Thus, only and ions are present in significant amounts in the cytosol (62% , 38% ).In extracellular fluid (pH = 7.4), this proportion is inverted (61% , 39% ).Inorganic phosphate can be present also as of pyrophosphate anions , which can give orthophosphate by hydrolysis