Abstract
An experiment on the determination of the magnetic susceptibility of several solid manganese compounds including KMnO4, MnO, MnTiO3, alpha-Mn2O3 and MnO2 with a simple, commercially available magnetic susceptibility balance (Johnson matthey) is described. The experiment is appropriate for a junior/senior level undergraduate inorganic or physical chemistry laboratory. The fundamental principles of magnetism and magnetic interactions in solids are introduced. The study of the magnetic susceptibility of the series of manganese oxides, with different formal oxidations states of the Mn ions in each, illustrates how the number of unpaired electrons and evidence of magnetic interactions may be determined from the magnetic data.
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