Preparation of  the complex compound [Cu(NH3)4]SO4, according to the following procedure:

  • Dissolve the supplied sample in 3 mL distilled water, and then add 5 mL concentrate NH3.
  • Precipitate the tetraammine complex by adding drop-wise 5 mL of rectified spirit.
  • After keeping the mixture in cold for an hour, filter the precipitate on a buckner funnel, wash it with 5 mL of 1:1 alcohol-ammonia mixture and finally with 5 mL alcohol and 3 mL ether.
  • Dry the precipitate on the funnel by suction. Submit the dry product and its weight to the examiner