This form is found in nature as the rare mineral romarchite. Structure Д«lack, О±-SnO adopts the tetragonal PbO layer structure containing four coordinate square pyramidal tin atoms. SnO is a reducing agent and is thought to reduce copper(I) to metallic clusters in the manufacture of so-called 'copper ruby glass'. It can be dissolved in strong acid solutions to give the ionic complexes Sn(OH 2) 3 2+ and Sn(OH)(OH 2) 2 +, and in less acid solutions to give Sn 3(OH) 4 2+. SnO is amphoteric, dissolving in strong acid to give tin(II) salts and in strong base to give stannites containing Sn(OH) 3 в€’.

4SnO в†’ Sn 3O 4 + Sn Sn 3O 4 в†’ 2SnO 2 + Sn When heated in an inert atmosphere initially disproportionation occurs giving Sn metal and Sn 3O 4 which further reacts to give SnO 2 and Sn metal. Tin(II) oxide burns in air with a dim green flame to form SnO 2. This method is also applied to the production of ferrous oxide and manganous oxide. SnO may be prepared as a pure substance in the laboratory, by controlled heating of tin(II) oxalate ( stannous oxalate) in the absence of air or under a CO 2 atmosphere. Metastable, red SnO can be prepared by gentle heating of the precipitate produced by the action of aqueous ammonia on a tin(II) salt. xH 2O (xBlue-black SnO can be produced by heating the tin(II) oxide hydrate, SnO

Heat of formation table pdf