The literature data on the methods of obtaining hydrated antimonic acid, which can be used as a solid electrolyte in fuel cells and gas sensors, were analyzed. Samples of antimonic acid were obtained experimentally, with electrical conductivity ranging from 0.1∙10^-2 Ω^-1∙m^-1 to 2∙10^-2 Ω^-1∙m^-1. The effect of relative humidity on the electrical conductivity of antimonic acid is shown.