The ion conductivity of zirconium hydrogen monothiophosphate (Zr(HPO3S)(2)(.)1.5H(2)O) has been measured by impedance spectroscopy. The measured value of proton conductivity is 3 x 10(-5) S/cm at 298 K. Conductivity was shown to decrease with increasing temperature due to a dehydration process. Above 450 K, the conductivity is likely governed by proton transport in the anhydrous phase Zr(HPO3S)(2). The activation energies of proton conductivity were measured to be 18 +/- 2 kJ/mol for Zr(HPO3S)(2)(.)1.5H(2)O and 60 +/- 3 kJ/mol for the anhydrous compound. The kinetics of ion exchange was studied with the use of potentiometric titration for several ion pairs, H+/Na+, H+/Zn2+, and Na+/Zn2+ in Zr(HPO3S)(2)(.)1.5H(2)O. The diffusion coefficient values for H+/Na+ ion exchange in Zr(HPO3S)(2). 1.5H(2)O are lower than those reported in cc-zirconium phosphate. At the same time, the mobility of zinc ions in Zr(HPO3S)(2.)1.5H(2)O is higher than sodium ion mobility. The ion exchange H+/Zn2+ is accompanied by the slow hydrolysis of the initial compound. In all cases, the powdered solids were evaluated by powder X-ray diffraction, and particle sizes were controlled by grinding and sieving the powders.