Lab Report: Determination of Iron in Cereals (I need the answer and calculation for this experiment)

     

Today's Experiment Absorbance 0.8 0.7 06 05 0.4 03 02 01 0 Concentration (mg/l) y-0.114x R-0.961 Beer's Law The amount of absorbed light is proportional to solution concentration. ThoughtCo LENGTH OF SAMPLE A-ELC ABSORBANCE MOLAR SOLUTION ASOPIVITY CONCENTRATION CONSTAN The iron present in cereal is extracted to form a solution containing Fe3+ (ferric) ions. To make the presence of these ions in solution visible, thiocyanate ions (SCN-) are added. These react with the Fe3+ ions to form a blood-red coloured complex: Fe3+ (aq) + SCN- (aq) [FeSCN]2+(ag) By comparing the absorbance value of this solution with the absorbance value of a series of standard solutions, with known Fe3+ concentrations, the concentration of iron in cereal can be determined.