in not given 0.1 or 0.033 M NaHSO3 and 0.1 M CuSO4 soln.; a copper(II) sulfite complex formed which is stable in acidic soln., but decomposes on influence of strong alkali;;
in water cited in Tanaka, H., Sadamoto, T., Thermochim. Acta, 54 (1982) 273; adding 10 wt.percent ammonium hydroxide soln. to 0.5 M aq. CuSO4 soln. until the soln. became deep blue; dropwise addn. of 1.0 M NaOH aq. soln. at 50-70°C; filtration of the ppt.;; washing with warm water; drying in air;;
Gyunner, E. A.; Yakhkind, N. D.
Russian Journal of Inorganic Chemistry (Translation of Zhurnal Neorganicheskoi Khimii), 1995 , vol. 40, p. 1567 - 1569
Zhurnal Neorganicheskoi Khimii, 1995 , vol. 40, p. 1629 - 1631
