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The hydrolysis of (CH 3 ) 2 Sn 2+ was studied potentiometrically, in different aqueous media (sodium and tetramethylammonium chlorides, sodium nitrate, sodium perchlorate, and sodium sulfate), in a wide range of ionic strength, at t ) 25°C. Least squares calculations are consistent with the formation of the species [M(OH)] + , [M(OH) 2 ] 0 , [M(OH) 3 ] -, [M 2 (OH) 2 ] 2+ , and [M 2 (OH) 3 ] + , with M ) (CH 3 ) 2 Sn 2+ . The dependence on ionic strength for different salt solutions was taken into account by using a Debye-Hü ckel type equation. Medium effects were explained by considering the formation of the chloride and sulfate complexes, [(CH 3 ) 2 SnCl] + , [(CH 3 ) 2 SnCl 2 ] 0 , [(CH 3 ) 2 Sn(OH)Cl] 0 , [(CH 3 ) 2 Sn(OH) 2 Cl] -, [(CH 3 ) 2 Sn(SO 4 )] 0 , [(CH 3 ) 2 Sn(SO 4 ) 2 ] 2-, [(CH 3 ) 2 Sn(OH)(SO 4 )] -, and [(CH 3 ) 2 Sn(OH) 2 (SO 4 )] 2-. Thermodynamic hydrolysis constants of (CH 3 ) 2 Sn 2+ and formation constants of the complex species with chloride and sulfate ions are reported.