| Stannous Orthoarsenite, Sn3(NaO3)2.H2O, was obtained by Stavenhagen by adding a solution of arsenious oxide to a solution containing potassium chlorostannite and potassium chloride. It may also be obtained by the action of sodium metarsenite or potassium tetrarsenite on a solution of stannous chloride. It is a white amorphous powder, sparingly soluble in water, but readily dissolved by dilute acids and alkalis with separation of metallic arsenic. It is also soluble in excess of arsenious acid. |
| Stannic Orthoarsenite, Sn3(NaO3)4.5½H2O, was obtained by Stavenhagen by adding an aqueous solution of arsenious oxide to one containing stannic and sodium chlorides. Addition of potassium tetrarsenite to a solution of stannic chloride gives a yellowish-white precipitate of a basic salt, 2SnO2.Sn3(NaO3)4; while with sodium metarsenite the composition of the precipitate corresponds with Sn7As2O17. These compounds decompose on heating. |