To determine the concentration of Fe2+ ions in a given iron tablet using colorimetry, you need to follow these steps:1. Prepare a standard solution of Fe2+ ions: First, you need to prepare a standard solution of Fe2+ ions with a known concentration. This can be done by dissolving a known amount of a soluble iron II salt, such as iron II sulfate FeSO4 , in a known volume of distilled water.2. Calibration curve: Next, you need to prepare a series of standard solutions with different concentrations of Fe2+ ions by diluting the stock solution. Measure the absorbance of each solution at a specific wavelength usually around 510 nm using a colorimeter or spectrophotometer. Plot the absorbance values against the concentration of Fe2+ ions to create a calibration curve.3. Sample preparation: Crush the iron tablet and dissolve it in a known volume of distilled water. It may be necessary to add a small amount of acid such as hydrochloric acid to dissolve the iron completely. Filter the solution to remove any undissolved particles.4. Reaction with a colorimetric reagent: To make the Fe2+ ions visible to the colorimeter, you need to react them with a colorimetric reagent that forms a colored complex with iron. One common reagent for this purpose is 1,10-phenanthroline, which forms a red-orange complex with Fe2+ ions. Add a known amount of the reagent to the sample solution and mix well.5. Measure the absorbance: After allowing the colored complex to form, measure the absorbance of the sample solution at the same wavelength used for the calibration curve around 510 nm .6. Determine the concentration: Using the absorbance value of the sample and the calibration curve, determine the concentration of Fe2+ ions in the sample solution. To find the concentration of Fe2+ ions in the original iron tablet, multiply the concentration in the sample solution by the dilution factor the ratio of the volume of the sample solution to the volume of the original tablet solution .By following these steps, you can determine the concentration of Fe2+ ions in a given iron tablet using colorimetry.