Applying a magnetic field across a solution of an iron salt can lead to interesting effects, but the outcome depends on various factors. Generally, a gradient may not form in a typical solution unless specific conditions are met. The oxidation state of the iron, whether ferrous (Fe²⁺) or ferric (Fe³⁺), plays a significant role in the behavior of the solution under a magnetic field. Ferrous ions are more susceptible to magnetic influences compared to ferric ions, which can impact the overall response. The discussion also references the "Guoy balance," a device used to measure magnetic susceptibility, indicating that the observed effects in solutions may be linked to the principles demonstrated by this balance.
