sodium hydroxide in water aq. NaOH added to aq. soln. of tartaric acid under vigorous stirring; aq. soln. of copper dichloride slowly added under vigorous stirring; precipitate filtered and washed with anhydrous ethanol; dried at 110°C for 1 h;

NaOH in water at pH 3-4.5;;

in water K,Na tartrate in H2O slowly added to aq. soln. of CuCl2 under vigorous stirring; filtered, washed (dry EtOH), dried at 100°C for 1 h;

in water prepn. by adding equiv. amts. of sodium tartrate to aq. soln. of metal chloride; soln. heated; maintained in water bath until total pptn.; ppt. washed (H2O); filtered; dried on filter papers; kept in desiccator (anhyd. CaCl2); elem. anal.;

in solid ceramic plate containing Cu tartrate placed into a quartz tube heated at250°C under vac. in an electric furnace for 30 min;

in not given 80°C;