CHM120H5 Lecture Notes - Lecture 1: Calibration Curve, Coordination Complex, Volumetric Flask
Document Summary
The compound to be synthesized, k[cr(c2o4)2(h2o)2]2h2o, is a typical transiion metal complex containing octahedrally coordinated chromium (iii). In it the chromium is surrounded by two bidentate oxalate ligands and two monodentate water ligands. It exists in cis and trans isometric forms as shown below. 1. By spectrophotometric analysis it was found that the cis isomer absorbs much more strongly that the trans isomer. This was irst recognized by observaion of the colour of the fresh cis and trans soluion at equivalent concentraions, which showed that the soluion of the trans isomer is much less intensely coloured. 2 the equaion for the redox reacion for the synthesis of this complex is: K2cr2o7 + 7 h2c2o42h2o 2k[cr(c2o4)2(h2o)2]2h2o + 6 co2 + 13h2o. The purpose of this experiment is to prepare and analyze the cis form of the aforemenioned complex, for chromium content. The analysis will be based on the characterisic blue-green colour of the cr 3+(aq) ion.
