Hey, guys..Just wondering if anyone could help me with this. UVvis-Spectroscopy
A 2.5g sample of fertilizer was weighed out and the iron II content was dissolved by stirring it with 25ml of 2M sulphuric acid. The solution was filtered into a 250ml volumetric flask. 0.01M KMno4 was added to the solution untill the first appearance of pink to ensure all of the Fe2+ were oxidised to Fe3+ ions. Finally, deionised water was added to make the solution up to a volume of 250ml.
50ml of the fertilizer solution was then transferred to a flask and 25ml of KSCN and HCL was added. Deionisated water was then added to bring the solution up to 250ml.
The solution was analysed using a spectrophotometer.
After sketching a calibration graph using the absorbance for the known concentration Fe3+ solutions, the concentration of the sample was determined to be 1.8ppm.
Detirmine the percentage by mass of fe2+ in the fertilizer.
Any help would be really appreciated, thanks!