where [OH]cor is the total quantity of sodium hydroxide (in mol)
added during the precipitation time t (in min) and the 1/8 coefficient
derives from the stoichiometric coefficient of the proton in Eqn. 1.
Because the initial iron solution is maintained under acidic conditions
to prevent precipitation of Fe (III), a correction volume is calculated
(33.3 mL), which is the volume of 0.1 mol L1 sodium hydroxide
necessary for bringing the iron-bearing solution to a pH of 10.5. This
volume is not used for the precipitation reaction and is therefore not
included in the calculation of the mean reaction rate.