CHM120H5 Lecture Notes - Lecture 15: Potassium Dichromate, Fume Hood, Watch Glass
Document Summary
This experiment involved the preparation of chromium (iii) complexes. The cis/trans isomeric pair provided an opportunity to look at isomerism in co-ordinate chemistry. 12gf of oxalic acid dihydrate was dissolved dissolved in a 400cm3 beaker in the minimum amount of boiling water. To this a potassium dichromate solution was added made by dissolving 4g of potassium dichromate in the minimum amount of water. The potassium dichromate was added in small portions due to the violent reaction. When the reaction was completed the dark coloured solution was left to crystallise in a large beaker covered with a watch glass. (ii) (iii) Preparation of cis-k [ cr (c2 o4)2 (h2 o)2 ]. Again, 12g of oxalic acid dihydrate was taken with 4g of potassium dischromate and they were ground into fine powders in the fume hood. Once mixing in the mortar was complete they were transferred to a 150cm3 beaker containing about 5 drops of water.
