In this experiment, we explore the use of redox titration to determine the percentage by mass of iron (II) sulfate in iron tablets. By using potassium manganate in acidic solution, we can observe the permanent pink colour that indicates the end-point of the titration. With careful measurements and calculations, we can calculate the amount of iron (II) ions in the tablets and compare it with the information from the supplier. This experiment demonstrates the application of titration in analyzing the composition of drugs and supplements.